//go:build llm_script && !scripts_pkg

package main

import (
	"database/sql"
	"encoding/json"
	"flag"
	"fmt"
	"log/slog"
	"os"
	"sort"
	"strings"
	"time"

	_ "github.com/lib/pq"
)

type signalModelInfo struct {
	Name            string
	ProviderName    string
	ProviderCountry string
	ContextLength   int
	InputPrice      float64
	OutputPrice     float64
	Currency        string
	IsFree          bool
	OperatorName    string
	OperatorType    string
}

type signalDailySignals struct {
	NewModels      int `json:"new_models"`
	PriceChanges   int `json:"price_changes"`
	OfficialFree   int `json:"official_free"`
	AggregatorFree int `json:"aggregator_free"`
	UnknownFree    int `json:"unknown_free"`
}

type signalModelEvent struct {
	EventType       string  `json:"event_type"`
	ModelName       string  `json:"model_name"`
	ProviderName    string  `json:"provider_name"`
	OperatorName    string  `json:"operator_name"`
	Audience        string  `json:"audience"`
	TrustLabel      string  `json:"trust_label"`
	SourceKindLabel string  `json:"source_kind_label"`
	PrimarySource   string  `json:"primary_source"`
	SourceURL       string  `json:"source_url"`
	UpdatedAt       string  `json:"updated_at"`
	EvidenceDetail  string  `json:"evidence_detail"`
	Baseline        string  `json:"baseline"`
	Summary         string  `json:"summary"`
	Currency        string  `json:"currency"`
	OldInputPrice   float64 `json:"old_input_price"`
	NewInputPrice   float64 `json:"new_input_price"`
	OldOutputPrice  float64 `json:"old_output_price"`
	NewOutputPrice  float64 `json:"new_output_price"`
	PriceChangePct  float64 `json:"price_change_pct"`
	Priority        int     `json:"priority"`
}

type signalPromoCampaignDefinition struct {
	Date            string `json:"date"`
	ModelName       string `json:"model_name"`
	ProviderName    string `json:"provider_name"`
	OperatorName    string `json:"operator_name"`
	Summary         string `json:"summary"`
	Audience        string `json:"audience"`
	Baseline        string `json:"baseline"`
	TrustLabel      string `json:"trust_label"`
	SourceKindLabel string `json:"source_kind_label"`
	PrimarySource   string `json:"primary_source"`
	EvidenceDetail  string `json:"evidence_detail"`
	Priority        int    `json:"priority"`
}

type dailySignalSnapshot struct {
	SignalDate      string
	Status          string
	Signals         signalDailySignals
	EventCount      int
	PageMode        string
	EventTypeCounts map[string]int
	TopEvents       []signalModelEvent
	SourceAudit     string
}

type materializeDailySignalsConfig struct {
	Date        string
	SourceAudit string
	DryRun      bool
}

var signalLogger *slog.Logger

const signalUSDToCNY = 7.25
const defaultDeepSeekNewsSignalURL = "https://api-docs.deepseek.com/news/news250120"
const defaultDeepSeekPricingSignalURL = "https://platform.deepseek.com/pricing"
const defaultDeepSeekAPIPricingSignalURL = "https://platform.deepseek.com/docs/api-pricing"


func init() {
	signalLogger = slog.New(slog.NewJSONHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelInfo}))
}

func main() {
	loadSignalEnv()

	var cfg materializeDailySignalsConfig
	flag.StringVar(&cfg.Date, "date", signalDateValue(), "信号日期，格式 YYYY-MM-DD")
	flag.StringVar(&cfg.SourceAudit, "source-audit", os.Getenv("SIGNAL_SOURCE_AUDIT"), "运行审计摘要")
	flag.BoolVar(&cfg.DryRun, "dry-run", false, "仅计算并打印摘要，不写入数据库")
	flag.Parse()

	db, err := sql.Open("postgres", defaultSignalDSN())
	if err != nil {
		fmt.Fprintf(os.Stderr, "open db: %v\n", err)
		os.Exit(1)
	}
	defer db.Close()

	if err := runMaterializeDailySignals(db, cfg); err != nil {
		fmt.Fprintf(os.Stderr, "materialize_daily_signals: %v\n", err)
		os.Exit(1)
	}
}

func loadSignalEnv() {
	for _, path := range []string{".env.local", ".env"} {
		data, err := os.ReadFile(path)
		if err != nil {
			continue
		}
		for _, line := range strings.Split(string(data), "\n") {
			line = strings.TrimSpace(line)
			if line == "" || strings.HasPrefix(line, "#") {
				continue
			}
			key, value, ok := strings.Cut(line, "=")
			if !ok {
				continue
			}
			key = strings.TrimSpace(key)
			value = strings.Trim(strings.TrimSpace(value), `"'`)
			if key == "" {
				continue
			}
			if _, exists := os.LookupEnv(key); exists {
				continue
			}
			_ = os.Setenv(key, value)
		}
	}
}

func defaultSignalDSN() string {
	if dsn := os.Getenv("DATABASE_URL"); dsn != "" {
		return dsn
	}
	return "postgres://long@/llm_intelligence?host=/var/run/postgresql"
}

func signalDateValue() string {
	if value := strings.TrimSpace(os.Getenv("REPORT_DATE")); value != "" {
		return value
	}
	return time.Now().Format("2006-01-02")
}

func runMaterializeDailySignals(db *sql.DB, cfg materializeDailySignalsConfig) error {
	signals, err := loadSignalDailySignals(db, cfg.Date)
	if err != nil {
		return err
	}
	freeSignals, err := loadSignalFreeBreakdown(db)
	if err != nil {
		return err
	}
	signals.OfficialFree = freeSignals.OfficialFree
	signals.AggregatorFree = freeSignals.AggregatorFree
	signals.UnknownFree = freeSignals.UnknownFree

	events, err := loadSignalModelEvents(db, cfg.Date)
	if err != nil {
		return err
	}

	snapshot := dailySignalSnapshot{
		SignalDate:      cfg.Date,
		Status:          "generated",
		Signals:         signals,
		EventCount:      len(events),
		PageMode:        buildSignalPageMode(signals, events),
		EventTypeCounts: summarizeSignalEventTypes(events),
		TopEvents:       events,
		SourceAudit:     strings.TrimSpace(cfg.SourceAudit),
	}

	if cfg.DryRun {
		fmt.Printf("source=daily-signal-materializer date=%s new_models=%d price_changes=%d event_count=%d page_mode=%s dry_run=true\n",
			snapshot.SignalDate, snapshot.Signals.NewModels, snapshot.Signals.PriceChanges, snapshot.EventCount, snapshot.PageMode)
		return nil
	}

	if err := upsertDailySignalSnapshot(db, snapshot); err != nil {
		return err
	}
	fmt.Printf("source=daily-signal-materializer date=%s new_models=%d price_changes=%d event_count=%d page_mode=%s dry_run=false\n",
		snapshot.SignalDate, snapshot.Signals.NewModels, snapshot.Signals.PriceChanges, snapshot.EventCount, snapshot.PageMode)
	return nil
}

func upsertDailySignalSnapshot(db *sql.DB, snapshot dailySignalSnapshot) error {
	eventTypeCounts, err := json.Marshal(snapshot.EventTypeCounts)
	if err != nil {
		return fmt.Errorf("marshal event_type_counts: %w", err)
	}
	topEvents, err := json.Marshal(snapshot.TopEvents)
	if err != nil {
		return fmt.Errorf("marshal top_events: %w", err)
	}

	_, err = db.Exec(
		`INSERT INTO daily_signal_snapshot (
			signal_date, status, new_models, price_changes,
			official_free, aggregator_free, unknown_free,
			event_count, page_mode, event_type_counts, top_events, source_audit
		) VALUES (
			$1::date, $2, $3, $4,
			$5, $6, $7,
			$8, $9, $10::jsonb, $11::jsonb, $12
		)
		ON CONFLICT (signal_date)
		DO UPDATE SET
			status = EXCLUDED.status,
			new_models = EXCLUDED.new_models,
			price_changes = EXCLUDED.price_changes,
			official_free = EXCLUDED.official_free,
			aggregator_free = EXCLUDED.aggregator_free,
			unknown_free = EXCLUDED.unknown_free,
			event_count = EXCLUDED.event_count,
			page_mode = EXCLUDED.page_mode,
			event_type_counts = EXCLUDED.event_type_counts,
			top_events = EXCLUDED.top_events,
			source_audit = EXCLUDED.source_audit,
			generated_at = CURRENT_TIMESTAMP,
			updated_at = CURRENT_TIMESTAMP`,
		snapshot.SignalDate, snapshot.Status, snapshot.Signals.NewModels, snapshot.Signals.PriceChanges,
		snapshot.Signals.OfficialFree, snapshot.Signals.AggregatorFree, snapshot.Signals.UnknownFree,
		snapshot.EventCount, snapshot.PageMode, string(eventTypeCounts), string(topEvents), signalNullIfBlank(snapshot.SourceAudit),
	)
	if err != nil {
		return fmt.Errorf("upsert daily_signal_snapshot: %w", err)
	}
	return nil
}

func loadSignalDailySignals(db *sql.DB, date string) (signalDailySignals, error) {
	signals := signalDailySignals{}

	if err := db.QueryRow(`
		SELECT COUNT(*)
		FROM models
		WHERE deleted_at IS NULL
		  AND DATE(created_at) = $1::date
	`, date).Scan(&signals.NewModels); err != nil {
		return signals, err
	}

	if err := db.QueryRow(`
		SELECT COUNT(*)
		FROM pricing_history
		WHERE DATE(changed_at) = $1::date
	`, date).Scan(&signals.PriceChanges); err != nil {
		return signals, err
	}
	return signals, nil
}

func loadSignalFreeBreakdown(db *sql.DB) (signalDailySignals, error) {
	rows, err := db.Query(`
		WITH latest_prices AS (
			SELECT
				rp.model_id,
				COALESCE(o.name, 'Unknown') AS operator_name,
				COALESCE(o.type, 'reseller') AS operator_type,
				rp.currency,
				rp.input_price_per_mtok,
				rp.output_price_per_mtok,
				rp.is_free,
				ROW_NUMBER() OVER (
					PARTITION BY rp.model_id
					ORDER BY rp.effective_date DESC NULLS LAST, rp.id DESC
				) AS rn
			FROM region_pricing rp
			LEFT JOIN operator o ON rp.operator_id = o.id
		)
		SELECT
			COALESCE(NULLIF(m.name, ''), m.external_id) AS model_name,
			COALESCE(mp.name, split_part(m.external_id, '/', 1)) AS provider_name,
			COALESCE(mp.country, 'unknown') AS provider_country,
			COALESCE(m.context_length, 0) AS context_length,
			COALESCE(lp.input_price_per_mtok, 0) AS input_price,
			COALESCE(lp.output_price_per_mtok, 0) AS output_price,
			COALESCE(lp.currency, 'USD') AS currency,
			COALESCE(lp.operator_name, 'OpenRouter') AS operator_name,
			COALESCE(lp.operator_type, 'reseller') AS operator_type
		FROM models m
		LEFT JOIN model_provider mp ON m.provider_id = mp.id
		LEFT JOIN latest_prices lp ON lp.model_id = m.id AND lp.rn = 1
		WHERE m.deleted_at IS NULL
		  AND COALESCE(lp.is_free, false) = true
	`)
	if err != nil {
		return signalDailySignals{}, err
	}
	defer rows.Close()

	signals := signalDailySignals{}
	for rows.Next() {
		var model signalModelInfo
		if err := rows.Scan(
			&model.Name,
			&model.ProviderName,
			&model.ProviderCountry,
			&model.ContextLength,
			&model.InputPrice,
			&model.OutputPrice,
			&model.Currency,
			&model.OperatorName,
			&model.OperatorType,
		); err != nil {
			return signalDailySignals{}, err
		}
		switch classifySignalFreeSource(model) {
		case "官方免费":
			signals.OfficialFree++
		case "聚合免费":
			signals.AggregatorFree++
		default:
			signals.UnknownFree++
		}
	}
	return signals, rows.Err()
}

func loadSignalModelEvents(db *sql.DB, date string) ([]signalModelEvent, error) {
	var events []signalModelEvent

	newModelEvents, err := loadSignalNewModelEvents(db, date)
	if err != nil {
		return nil, err
	}
	events = append(events, newModelEvents...)

	releaseEvents, err := loadSignalOfficialReleaseEvents(db, date)
	if err != nil {
		return nil, err
	}
	events = append(events, releaseEvents...)

	promoEvents, err := loadSignalPromoCampaignEvents(date)
	if err != nil {
		return nil, err
	}
	events = append(events, promoEvents...)

	priceEvents, err := loadSignalPriceChangeEvents(db, date)
	if err != nil {
		return nil, err
	}
	events = append(events, priceEvents...)

	discoveryEvents, err := loadVerifiedDiscoverySignalEvents(db, date)
	if err != nil {
		return nil, err
	}
	events = mergeVerifiedDiscoveryEvents(events, discoveryEvents)
	deepseekDriftEvents, err := loadDeepSeekNewsDriftSignalEvents(db)
	if err != nil {
		return nil, err
	}
	events = mergeVerifiedDiscoveryEvents(events, deepseekDriftEvents)

	sort.Slice(events, func(i, j int) bool {
		if events[i].Priority != events[j].Priority {
			return events[i].Priority > events[j].Priority
		}
		return events[i].ModelName < events[j].ModelName
	})

	return dedupeSignalEvents(events), nil
}

func loadSignalPromoCampaignEvents(date string) ([]signalModelEvent, error) {
	path, err := resolveSignalPromoCampaignDataPath()
	if err != nil {
		if os.IsNotExist(err) {
			return nil, nil
		}
		return nil, err
	}
	body, err := os.ReadFile(path)
	if err != nil {
		return nil, err
	}

	var definitions []signalPromoCampaignDefinition
	if err := json.Unmarshal(body, &definitions); err != nil {
		return nil, err
	}

	events := make([]signalModelEvent, 0)
	for _, definition := range definitions {
		if definition.Date != date {
			continue
		}
		events = append(events, signalModelEvent{
			EventType:       "promo_campaign",
			ModelName:       definition.ModelName,
			ProviderName:    definition.ProviderName,
			OperatorName:    definition.OperatorName,
			Audience:        signalFirstNonEmpty(definition.Audience, "适合计划利用活动窗口压低成本的团队"),
			TrustLabel:      signalFirstNonEmpty(definition.TrustLabel, "官方来源 / 一级证据"),
			SourceKindLabel: signalFirstNonEmpty(definition.SourceKindLabel, "官方活动页"),
			PrimarySource:   definition.PrimarySource,
			SourceURL:       definition.PrimarySource,
			UpdatedAt:       signalFormatEventUpdatedAt("", definition.Date),
			EvidenceDetail:  definition.EvidenceDetail,
			Baseline:        signalFirstNonEmpty(definition.Baseline, "活动窗口开启"),
			Summary:         definition.Summary,
			Priority:        signalMaxInt(definition.Priority, 115),
		})
	}
	return events, nil
}

func resolveSignalPromoCampaignDataPath() (string, error) {
	candidates := []string{
		filepathJoin("scripts", "testdata", "report_promo_campaigns.json"),
		filepathJoin("testdata", "report_promo_campaigns.json"),
	}
	for _, candidate := range candidates {
		if _, err := os.Stat(candidate); err == nil {
			return candidate, nil
		}
	}
	return "", os.ErrNotExist
}

func loadSignalOfficialReleaseEvents(db *sql.DB, date string) ([]signalModelEvent, error) {
	rows, err := db.Query(`
		WITH latest_prices AS (
			SELECT
				rp.model_id,
				COALESCE(o.name, 'Unknown') AS operator_name,
				COALESCE(o.type, 'reseller') AS operator_type,
				rp.currency,
				ROW_NUMBER() OVER (
					PARTITION BY rp.model_id
					ORDER BY rp.effective_date DESC NULLS LAST, rp.id DESC
				) AS rn
			FROM region_pricing rp
			LEFT JOIN operator o ON rp.operator_id = o.id
		)
		SELECT
			COALESCE(NULLIF(m.name, ''), m.external_id) AS model_name,
			COALESCE(mp.name, split_part(m.external_id, '/', 1)) AS provider_name,
			COALESCE(lp.operator_name, 'Unknown') AS operator_name,
			COALESCE(lp.operator_type, 'reseller') AS operator_type,
			COALESCE(m.source_url, '') AS source_url,
			COALESCE(m.date_confidence, 'unknown') AS date_confidence,
			COALESCE(m.date_source_kind, 'unknown') AS date_source_kind,
			COALESCE(mp.country, 'unknown') AS provider_country,
			COALESCE(m.release_date, m.created_at::date) AS release_date,
			COALESCE(lp.currency, 'USD') AS currency
		FROM models m
		LEFT JOIN model_provider mp ON m.provider_id = mp.id
		LEFT JOIN latest_prices lp ON lp.model_id = m.id AND lp.rn = 1
		WHERE m.deleted_at IS NULL
		  AND m.release_date = $1::date
		  AND COALESCE(m.source_url, '') <> ''
		  AND COALESCE(lp.operator_type, 'reseller') IN ('official', 'cloud')
		ORDER BY m.release_date DESC, m.id DESC
		LIMIT 8
	`, date)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var events []signalModelEvent
	for rows.Next() {
		var (
			modelName       string
			providerName    string
			operatorName    string
			operatorType    string
			sourceURL       string
			dateConfidence  string
			dateSourceKind  string
			providerCountry string
			releaseDate     time.Time
			currency        string
		)
		if err := rows.Scan(
			&modelName,
			&providerName,
			&operatorName,
			&operatorType,
			&sourceURL,
			&dateConfidence,
			&dateSourceKind,
			&providerCountry,
			&releaseDate,
			&currency,
		); err != nil {
			return nil, err
		}

		model := signalModelInfo{
			Name:            modelName,
			ProviderName:    providerName,
			ProviderCountry: providerCountry,
			Currency:        currency,
			OperatorName:    operatorName,
			OperatorType:    operatorType,
		}

		events = append(events, signalModelEvent{
			EventType:       "official_release",
			ModelName:       modelName,
			ProviderName:    providerName,
			OperatorName:    operatorName,
			Audience:        "适合需要复查默认选型与路线图判断的团队",
			TrustLabel:      buildSignalReleaseTrustLabel(model, dateConfidence),
			SourceKindLabel: buildSignalReleaseSourceKindLabel(dateSourceKind, dateConfidence),
			PrimarySource:   sourceURL,
			SourceURL:       sourceURL,
			UpdatedAt:       releaseDate.Format("2006-01-02 15:04"),
			EvidenceDetail:  buildSignalReleaseEvidenceDetail(dateSourceKind, dateConfidence),
			Baseline:        "官方首次发布",
			Summary:         fmt.Sprintf("%s 官方发布新模型，值得优先复查默认选型。", providerName),
			Currency:        currency,
			Priority:        120,
		})
	}
	return events, rows.Err()
}

func loadSignalNewModelEvents(db *sql.DB, date string) ([]signalModelEvent, error) {
	rows, err := db.Query(`
		WITH latest_prices AS (
			SELECT
				rp.model_id,
				COALESCE(o.name, 'Unknown') AS operator_name,
				COALESCE(o.type, 'reseller') AS operator_type,
				rp.currency,
				rp.input_price_per_mtok,
				rp.output_price_per_mtok,
				rp.is_free,
				ROW_NUMBER() OVER (
					PARTITION BY rp.model_id
					ORDER BY rp.effective_date DESC NULLS LAST, rp.id DESC
				) AS rn
			FROM region_pricing rp
			LEFT JOIN operator o ON rp.operator_id = o.id
		)
		SELECT
			COALESCE(NULLIF(m.name, ''), m.external_id) AS model_name,
			COALESCE(mp.name, split_part(m.external_id, '/', 1)) AS provider_name,
			COALESCE(lp.operator_name, 'OpenRouter') AS operator_name,
			COALESCE(lp.operator_type, 'reseller') AS operator_type,
			COALESCE(lp.currency, 'USD') AS currency,
			COALESCE(lp.input_price_per_mtok, 0) AS input_price,
			COALESCE(lp.output_price_per_mtok, 0) AS output_price,
			COALESCE(lp.is_free, false) AS is_free,
			COALESCE(m.context_length, 0) AS context_length,
			COALESCE(mp.country, 'unknown') AS provider_country,
			m.created_at
		FROM models m
		LEFT JOIN model_provider mp ON m.provider_id = mp.id
		LEFT JOIN latest_prices lp ON lp.model_id = m.id AND lp.rn = 1
		WHERE m.deleted_at IS NULL
		  AND DATE(m.created_at) = $1::date
		ORDER BY m.created_at DESC, m.id DESC
		LIMIT 8
	`, date)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var events []signalModelEvent
	for rows.Next() {
		var model signalModelInfo
		var createdAt time.Time
		if err := rows.Scan(
			&model.Name,
			&model.ProviderName,
			&model.OperatorName,
			&model.OperatorType,
			&model.Currency,
			&model.InputPrice,
			&model.OutputPrice,
			&model.IsFree,
			&model.ContextLength,
			&model.ProviderCountry,
			&createdAt,
		); err != nil {
			return nil, err
		}

		summary := "新模型进入情报池，值得重新评估当前默认选择。"
		if model.IsFree {
			summary = fmt.Sprintf("新模型首日可免费试用，需注意其免费来源属于%s。", classifySignalFreeSource(model))
		} else if model.ContextLength >= 1024*256 {
			summary = fmt.Sprintf("新模型带来 %s 长上下文，值得复查 Agent 和代码场景。", signalFormatContextWindowCompact(model.ContextLength))
		}

		events = append(events, signalModelEvent{
			EventType:       "new_model",
			ModelName:       model.Name,
			ProviderName:    model.ProviderName,
			OperatorName:    model.OperatorName,
			Audience:        "适合想尽快验证新模型价值的选型读者",
			TrustLabel:      buildSignalTrustLabel(model),
			SourceKindLabel: "模型快照",
			PrimarySource:   buildSignalPrimarySource("region_pricing", model.OperatorName),
			SourceURL:       buildSignalPrimarySource("region_pricing", model.OperatorName),
			UpdatedAt:       createdAt.Format("2006-01-02 15:04"),
			EvidenceDetail:  "models.created_at = 今日，且已存在最新价格快照",
			Baseline:        "首次出现",
			Summary:         summary,
			Currency:        model.Currency,
			NewInputPrice:   model.InputPrice,
			NewOutputPrice:  model.OutputPrice,
			Priority:        85 + signalMinInt(model.ContextLength/(1024*128), 10),
		})
	}
	return events, rows.Err()
}

func loadSignalPriceChangeEvents(db *sql.DB, date string) ([]signalModelEvent, error) {
	rows, err := db.Query(`
		WITH latest_prices AS (
			SELECT
				rp.model_id,
				COALESCE(o.name, 'Unknown') AS operator_name,
				COALESCE(o.type, 'reseller') AS operator_type,
				ROW_NUMBER() OVER (
					PARTITION BY rp.model_id
					ORDER BY rp.effective_date DESC NULLS LAST, rp.id DESC
				) AS rn
			FROM region_pricing rp
			LEFT JOIN operator o ON rp.operator_id = o.id
		)
		SELECT
			COALESCE(NULLIF(m.name, ''), m.external_id) AS model_name,
			COALESCE(mp.name, split_part(m.external_id, '/', 1)) AS provider_name,
			COALESCE(lp.operator_name, 'OpenRouter') AS operator_name,
			COALESCE(lp.operator_type, 'reseller') AS operator_type,
			ph.currency,
			COALESCE(ph.old_input_price, 0),
			COALESCE(ph.new_input_price, 0),
			COALESCE(ph.old_output_price, 0),
			COALESCE(ph.new_output_price, 0),
			COALESCE(mp.country, 'unknown') AS provider_country,
			ph.changed_at
		FROM pricing_history ph
		JOIN models m ON ph.model_id = m.id
		LEFT JOIN model_provider mp ON m.provider_id = mp.id
		LEFT JOIN latest_prices lp ON lp.model_id = m.id AND lp.rn = 1
		WHERE DATE(ph.changed_at) = $1::date
		ORDER BY ph.changed_at DESC, ph.id DESC
		LIMIT 16
	`, date)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var events []signalModelEvent
	for rows.Next() {
		var (
			model signalModelInfo
			oldInputPrice  float64
			newInputPrice  float64
			oldOutputPrice float64
			newOutputPrice float64
			changedAt      time.Time
		)
		if err := rows.Scan(
			&model.Name,
			&model.ProviderName,
			&model.OperatorName,
			&model.OperatorType,
			&model.Currency,
			&oldInputPrice,
			&newInputPrice,
			&oldOutputPrice,
			&newOutputPrice,
			&model.ProviderCountry,
			&changedAt,
		); err != nil {
			return nil, err
		}

		changePct := signalSignedPriceChangePct(oldInputPrice, newInputPrice, oldOutputPrice, newOutputPrice)
		if changePct == 0 {
			continue
		}

		eventType := "price_increase"
		summary := "价格上调已足以影响默认成本，需要确认备用模型。"
		if changePct < 0 {
			eventType = "price_cut"
			summary = "价格下降已足以影响默认选型，值得重新评估同类模型。"
		}

		events = append(events, signalModelEvent{
			EventType:       eventType,
			ModelName:       model.Name,
			ProviderName:    model.ProviderName,
			OperatorName:    model.OperatorName,
			Audience:        buildSignalPriceEventAudience(changePct),
			TrustLabel:      buildSignalTrustLabel(model),
			SourceKindLabel: "价格快照",
			PrimarySource:   "pricing_history",
			SourceURL:       buildSignalPrimarySource("region_pricing", model.OperatorName),
			UpdatedAt:       changedAt.Format("2006-01-02 15:04"),
			EvidenceDetail:  buildSignalPriceEvidenceDetail(changePct, oldInputPrice, newInputPrice, model.Currency),
			Baseline:        fmt.Sprintf("较昨日 %+.0f%%", changePct),
			Summary:         summary,
			Currency:        model.Currency,
			OldInputPrice:   oldInputPrice,
			NewInputPrice:   newInputPrice,
			OldOutputPrice:  oldOutputPrice,
			NewOutputPrice:  newOutputPrice,
			PriceChangePct:  changePct,
			Priority:        70 + signalMinInt(int(signalAbs(changePct)), 25),
		})
	}
	return events, rows.Err()
}

func summarizeSignalEventTypes(events []signalModelEvent) map[string]int {
	counts := make(map[string]int)
	for _, event := range events {
		counts[event.EventType]++
	}
	return counts
}

func dedupeSignalEvents(events []signalModelEvent) []signalModelEvent {
	seen := make(map[string]struct{})
	result := make([]signalModelEvent, 0, len(events))
	for _, event := range events {
		key := event.EventType + "|" + event.ModelName
		if _, exists := seen[key]; exists {
			continue
		}
		seen[key] = struct{}{}
		result = append(result, event)
	}
	return result
}

func loadVerifiedDiscoverySignalEvents(db *sql.DB, date string) ([]signalModelEvent, error) {
	rows, err := db.Query(`
		SELECT
			event_type,
			provider_name,
			COALESCE(model_name, ''),
			COALESCE(provider_country, ''),
			title,
			COALESCE(summary, ''),
			COALESCE(candidate_urls::text, '[]'),
			COALESCE(verification_notes, ''),
			updated_at
		FROM intraday_news_candidate
		WHERE candidate_date = $1::date
		  AND status = 'verified'
		  AND verification_confidence = 'official_confirmed'
		ORDER BY updated_at DESC, id DESC
	`, date)
	if err != nil {
		if strings.Contains(err.Error(), `relation "intraday_news_candidate" does not exist`) {
			return nil, nil
		}
		return nil, err
	}
	defer rows.Close()

	var events []signalModelEvent
	for rows.Next() {
		var (
			eventType       string
			providerName    string
			modelName       string
			providerCountry string
			title           string
			summary         string
			rawURLs         string
			notes           string
			updatedAt       time.Time
		)
		if err := rows.Scan(&eventType, &providerName, &modelName, &providerCountry, &title, &summary, &rawURLs, &notes, &updatedAt); err != nil {
			return nil, err
		}
		var urls []string
		if err := json.Unmarshal([]byte(rawURLs), &urls); err != nil {
			return nil, fmt.Errorf("unmarshal discovery candidate urls: %w", err)
		}
		primaryURL := firstString(urls)
		if strings.TrimSpace(primaryURL) == "" {
			continue
		}
		normalizedType := signalNormalizeIntradayEventType(eventType)
		events = append(events, signalModelEvent{
			EventType:       normalizedType,
			ModelName:       signalFirstNonEmpty(modelName, title),
			ProviderName:    providerName,
			OperatorName:    providerName,
			Audience:        buildDiscoveryAudience(normalizedType),
			TrustLabel:      "官方来源 / discovery 验证",
			SourceKindLabel: buildDiscoverySourceKind(normalizedType),
			PrimarySource:   primaryURL,
			SourceURL:       primaryURL,
			UpdatedAt:       updatedAt.Format("2006-01-02 15:04"),
			EvidenceDetail:  signalFirstNonEmpty(notes, summary),
			Baseline:        buildDiscoveryBaseline(normalizedType),
			Summary:         signalFirstNonEmpty(summary, title),
			Priority:        buildDiscoveryPriority(normalizedType),
		})
	}
	if err := rows.Err(); err != nil {
		return nil, err
	}
	return filterVerifiedDiscoverySignalEvents(events), nil
}

func filterVerifiedDiscoverySignalEvents(events []signalModelEvent) []signalModelEvent {
	filtered := make([]signalModelEvent, 0, len(events))
	for _, event := range events {
		switch event.EventType {
		case "official_release", "promo_campaign", "price_cut", "price_increase":
			filtered = append(filtered, event)
		}
	}
	return filtered
}

func mergeVerifiedDiscoveryEvents(nativeEvents, discoveryEvents []signalModelEvent) []signalModelEvent {
	merged := append([]signalModelEvent{}, nativeEvents...)
	index := make(map[string]int, len(merged))
	for i, event := range merged {
		index[signalEventMergeKey(event)] = i
	}
	for _, event := range filterVerifiedDiscoverySignalEvents(discoveryEvents) {
		key := signalEventMergeKey(event)
		if idx, exists := index[key]; exists {
			merged[idx] = mergeSignalEventEvidence(merged[idx], event)
			continue
		}
		index[key] = len(merged)
		merged = append(merged, event)
	}
	return merged
}

func mergeSignalEventEvidence(native, discovery signalModelEvent) signalModelEvent {
	merged := native
	if strings.TrimSpace(merged.SourceKindLabel) == "" {
		merged.SourceKindLabel = discovery.SourceKindLabel
	}
	if strings.TrimSpace(merged.SourceURL) == "" {
		merged.SourceURL = discovery.SourceURL
	}
	if strings.TrimSpace(merged.PrimarySource) == "" {
		merged.PrimarySource = discovery.PrimarySource
	}
	if strings.TrimSpace(merged.EvidenceDetail) == "" {
		merged.EvidenceDetail = discovery.EvidenceDetail
	}
	if strings.TrimSpace(merged.TrustLabel) == "" {
		merged.TrustLabel = discovery.TrustLabel
	}
	return merged
}

func signalEventMergeKey(event signalModelEvent) string {
	return strings.Join([]string{
		signalNormalizeIntradayEventType(event.EventType),
		signalNormalizeWord(event.ProviderName),
		signalNormalizeWord(event.ModelName),
	}, "|")
}

func buildDiscoveryAudience(eventType string) string {
	switch eventType {
	case "official_release":
		return "适合需要尽快复查默认选型与路线图影响的团队"
	case "promo_campaign":
		return "适合想利用活动窗口压低成本的团队"
	case "price_cut":
		return "适合准备趁降价重排默认模型的团队"
	case "price_increase":
		return "适合提前准备替代模型和预算回退方案的团队"
	default:
		return "适合关注日内情报变化的读者"
	}
}

func buildDiscoverySourceKind(eventType string) string {
	switch eventType {
	case "official_release":
		return "discovery 验证 / 官方发布页"
	case "promo_campaign":
		return "discovery 验证 / 官方活动页"
	case "price_cut", "price_increase":
		return "discovery 验证 / 官方价格页"
	default:
		return "discovery 验证"
	}
}

func buildDiscoveryBaseline(eventType string) string {
	switch eventType {
	case "official_release":
		return "discovery 验证通过"
	case "promo_campaign":
		return "活动窗口已验证"
	case "price_cut", "price_increase":
		return "official_confirmed"
	default:
		return "discovery verified"
	}
}

func buildDiscoveryPriority(eventType string) int {
	switch eventType {
	case "official_release":
		return 118
	case "promo_campaign":
		return 112
	case "price_cut":
		return 96
	case "price_increase":
		return 94
	default:
		return 80
	}
}

func firstString(values []string) string {
	for _, value := range values {
		if strings.TrimSpace(value) != "" {
			return value
		}
	}
	return ""
}

func loadDeepSeekNewsDriftSignalEvents(db *sql.DB) ([]signalModelEvent, error) {
	return loadDeepSeekSignatureSignalEvents(db, []deepseekSignatureEventConfig{
		{
			SourceKey:        "deepseek_news_signature",
			ModelName:        "DeepSeek 官方新闻页",
			SourceKindLabel:  "官方新闻页结构变化",
			PrimaryURL:       defaultDeepSeekNewsSignalURL,
			Audience:         "适合需要尽快复查 DeepSeek 路线图与默认选型的团队",
			EvidenceTemplate: "DeepSeek 官方新闻页结构签名发生变化：sha=%s previous=%s",
			Baseline:         "官方新闻页结构漂移",
			Summary:          "DeepSeek 官方新闻页结构发生变化，需优先确认是否出现新发布或路线图更新。",
			Priority:         117,
		},
		{
			SourceKey:        "deepseek_pricing_signature",
			ModelName:        "DeepSeek 官方价格页",
			SourceKindLabel:  "官方价格页结构变化",
			PrimaryURL:       defaultDeepSeekPricingSignalURL,
			Audience:         "适合需要尽快复查 DeepSeek 价格策略与默认成本模型的团队",
			EvidenceTemplate: "DeepSeek 官方价格页结构签名发生变化：sha=%s previous=%s",
			Baseline:         "官方价格页结构漂移",
			Summary:          "DeepSeek 官方价格页结构发生变化，需优先确认是否出现价格策略更新。",
			Priority:         116,
		},
		{
			SourceKey:        "deepseek_api_pricing_signature",
			ModelName:        "DeepSeek API 定价页",
			SourceKindLabel:  "官方 API 定价页结构变化",
			PrimaryURL:       defaultDeepSeekAPIPricingSignalURL,
			Audience:         "适合需要尽快复查 DeepSeek API 定价与预算预期的团队",
			EvidenceTemplate: "DeepSeek API 定价页结构签名发生变化：sha=%s previous=%s",
			Baseline:         "官方 API 定价页结构漂移",
			Summary:          "DeepSeek API 定价页结构发生变化，需优先确认是否出现定价或套餐更新。",
			Priority:         115,
		},
	})
}

type deepseekSignatureEventConfig struct {
	SourceKey        string
	ModelName        string
	SourceKindLabel  string
	PrimaryURL       string
	Audience         string
	EvidenceTemplate string
	Baseline         string
	Summary          string
	Priority         int
}

func loadDeepSeekSignatureSignalEvents(db *sql.DB, configs []deepseekSignatureEventConfig) ([]signalModelEvent, error) {
	if len(configs) == 0 {
		return nil, nil
	}
	var events []signalModelEvent
	for _, cfg := range configs {
		_, rows, err := queryOfficialImportSignatureAuditWindow(db, 5, cfg.SourceKey, false)
		if err != nil {
			if strings.Contains(err.Error(), `relation "official_import_signature_audit_recent_view" does not exist`) ||
				strings.Contains(err.Error(), `relation "official_import_signature_audit" does not exist`) {
				return nil, nil
			}
			return nil, err
		}
		for _, row := range rows {
			if row.RecentRank != 1 {
				continue
			}
			if event, ok := buildDeepSeekSignatureSignalEvent(row, cfg); ok {
				events = append(events, event)
			}
			break
		}
	}
	return events, nil
}

func buildDeepSeekSignatureSignalEvent(row officialImportSignatureAuditViewRow, cfg deepseekSignatureEventConfig) (signalModelEvent, bool) {
	if row.SourceKey != cfg.SourceKey || !row.DriftDetected {
		return signalModelEvent{}, false
	}
	updatedAt := row.CheckedAt.Format("2006-01-02 15:04")
	primarySource := nullStringOrNone(row.SnapshotPath)
	if primarySource == "none" {
		primarySource = cfg.PrimaryURL
	}
	return signalModelEvent{
		EventType:       "official_release",
		ModelName:       cfg.ModelName,
		ProviderName:    "DeepSeek",
		OperatorName:    "DeepSeek",
		Audience:        cfg.Audience,
		TrustLabel:      "官方来源 / 结构漂移告警",
		SourceKindLabel: cfg.SourceKindLabel,
		PrimarySource:   primarySource,
		SourceURL:       cfg.PrimaryURL,
		UpdatedAt:       updatedAt,
		EvidenceDetail:  fmt.Sprintf(cfg.EvidenceTemplate, row.StructureSHA256, nullStringOrNone(row.PreviousObservedSHA256)),
		Baseline:        cfg.Baseline,
		Summary:         cfg.Summary,
		Priority:        cfg.Priority,
	}, true
}

func signalNormalizeIntradayEventType(value string) string {
	switch strings.TrimSpace(strings.ToLower(value)) {
	case "price_cut":
		return "price_cut"
	case "price_increase":
		return "price_increase"
	case "official_release":
		return "official_release"
	case "promo_campaign":
		return "promo_campaign"
	default:
		return "unknown"
	}
}

func signalNormalizeWord(value string) string {
	value = strings.ToLower(strings.TrimSpace(value))
	value = strings.ReplaceAll(value, "_", "-")
	var b strings.Builder
	lastDash := false
	for _, r := range value {
		isAlphaNum := (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9')
		if isAlphaNum {
			b.WriteRune(r)
			lastDash = false
			continue
		}
		if !lastDash {
			b.WriteByte('-')
			lastDash = true
		}
	}
	result := strings.Trim(b.String(), "-")
	if result == "" {
		return "unknown"
	}
	return result
}

func classifySignalFreeSource(model signalModelInfo) string {
	switch model.OperatorType {
	case "official", "cloud":
		return "官方免费"
	case "reseller":
		if isSignalVerifiedAggregator(model.OperatorName) {
			return "聚合免费"
		}
	}
	return "待确认"
}

func isSignalVerifiedAggregator(name string) bool {
	switch strings.ToLower(strings.TrimSpace(name)) {
	case "openrouter", "siliconflow", "fireworks", "groq":
		return true
	default:
		return false
	}
}

func buildSignalPageMode(signals signalDailySignals, events []signalModelEvent) string {
	if hasSignalEventType(events, "official_release") || hasSignalEventType(events, "promo_campaign") {
		return "hot"
	}
	if signals.NewModels == 0 && signals.PriceChanges == 0 {
		return "calm"
	}
	if signals.NewModels+signals.PriceChanges >= 3 {
		return "hot"
	}
	return "standard"
}

func hasSignalEventType(events []signalModelEvent, eventType string) bool {
	for _, event := range events {
		if event.EventType == eventType {
			return true
		}
	}
	return false
}

func buildSignalTrustLabel(model signalModelInfo) string {
	switch model.OperatorType {
	case "official", "cloud":
		return "官方来源"
	case "reseller":
		if isSignalVerifiedAggregator(model.OperatorName) {
			return "聚合来源"
		}
	}
	return "待验证来源"
}

func buildSignalPrimarySource(sourceKind, operatorName string) string {
	switch sourceKind {
	case "region_pricing":
		if operatorName == "" {
			return "region_pricing"
		}
		return operatorName + " / region_pricing"
	default:
		return sourceKind
	}
}

func buildSignalPriceEvidenceDetail(changePct, oldPrice, newPrice float64, currency string) string {
	direction := "上涨"
	if changePct < 0 {
		direction = "下降"
	}
	return fmt.Sprintf(
		"pricing_history 记录到输入价格由 %s 调整为 %s，较昨日%s %.0f%%",
		signalFormatPrice(oldPrice, currency),
		signalFormatPrice(newPrice, currency),
		direction,
		signalAbs(changePct),
	)
}

func buildSignalReleaseSourceKindLabel(dateSourceKind, dateConfidence string) string {
	switch {
	case dateSourceKind == "secondary_authoritative_report" || dateConfidence == "secondary_authoritative":
		return "二级权威佐证发布"
	case dateSourceKind == "official_announcement" && dateConfidence == "official_primary":
		return "一级官方发布"
	case dateSourceKind == "official_product_page":
		return "官方产品页"
	case dateSourceKind == "catalog_backfill":
		return "目录回填"
	default:
		return "一级官方发布"
	}
}

func buildSignalReleaseEvidenceDetail(dateSourceKind, dateConfidence string) string {
	switch {
	case dateSourceKind == "secondary_authoritative_report" || dateConfidence == "secondary_authoritative":
		return "models.release_date = 今日，发布日期采用次级权威报道佐证，模型来源页保留官方文档"
	case dateSourceKind == "official_announcement" && dateConfidence == "official_primary":
		return "models.release_date = 今日，且 source_url 指向官方发布页"
	case dateSourceKind == "official_product_page":
		return "models.release_date = 今日，来源页为官方产品页，发布日期置信度待确认"
	case dateSourceKind == "catalog_backfill":
		return "models.release_date = 今日，发布日期来自目录级元数据回填"
	default:
		return "models.release_date = 今日，且已记录发布日期证据元数据"
	}
}

func buildSignalReleaseTrustLabel(model signalModelInfo, dateConfidence string) string {
	base := buildSignalTrustLabel(model)
	switch dateConfidence {
	case "official_primary":
		return base + " / 一级证据"
	case "secondary_authoritative":
		return base + " / 二级佐证"
	default:
		return base
	}
}

func buildSignalPriceEventAudience(changePct float64) string {
	if changePct < 0 {
		return "适合以成本为先、准备趁降价重排默认选型的团队"
	}
	return "适合需要提前准备替代模型和预算回退方案的团队"
}

func signalFormatEventUpdatedAt(value, fallbackDate string) string {
	if strings.TrimSpace(value) != "" {
		return value
	}
	if fallbackDate != "" {
		return fallbackDate + " 00:00"
	}
	return "-"
}

func signalFormatPrice(price float64, currency string) string {
	if price <= 0 {
		return "免费"
	}
	if currency == "CNY" {
		if price < 1 {
			return fmt.Sprintf("¥%.2f", price)
		}
		return fmt.Sprintf("¥%.1f", price)
	}
	cny := price * signalUSDToCNY
	if cny < 1 {
		return fmt.Sprintf("¥%.2f", cny)
	}
	return fmt.Sprintf("¥%.1f", cny)
}

func signalFormatContextWindowCompact(value int) string {
	if value <= 0 {
		return "-"
	}
	if value%(1024*1024) == 0 {
		return fmt.Sprintf("%dM", value/(1024*1024))
	}
	if value%1024 == 0 {
		return fmt.Sprintf("%dK", value/1024)
	}
	return fmt.Sprintf("%d", value)
}

func signalSignedPriceChangePct(oldInput, newInput, oldOutput, newOutput float64) float64 {
	inputPct := signalSignedChange(oldInput, newInput)
	outputPct := signalSignedChange(oldOutput, newOutput)
	if signalAbs(inputPct) >= signalAbs(outputPct) {
		return inputPct
	}
	return outputPct
}

func signalSignedChange(oldValue, newValue float64) float64 {
	if oldValue == 0 {
		if newValue == 0 {
			return 0
		}
		return 100
	}
	return ((newValue - oldValue) / oldValue) * 100
}

func signalFirstNonEmpty(values ...string) string {
	for _, value := range values {
		if strings.TrimSpace(value) != "" {
			return value
		}
	}
	return ""
}

func signalAbs(v float64) float64 {
	if v < 0 {
		return -v
	}
	return v
}

func signalMinInt(a, b int) int {
	if a < b {
		return a
	}
	return b
}

func signalMaxInt(a, b int) int {
	if a > b {
		return a
	}
	return b
}

func filepathJoin(parts ...string) string {
	return strings.Join(parts, string(os.PathSeparator))
}

func signalNullIfBlank(value string) any {
	if strings.TrimSpace(value) == "" {
		return nil
	}
	return value
}