//go:build llm_script && !scripts_pkg

package main

import (
	"database/sql"
	"encoding/json"
	"flag"
	"fmt"
	"io"
	"net/http"
	"os"
	"regexp"
	"strconv"
	"strings"
	"time"

	_ "github.com/lib/pq"
)

type importTencentSubscriptionConfig struct {
	URL     string
	Fixture string
	DryRun  bool
	Timeout time.Duration
}

type subscriptionPlanRow struct {
	ProviderName    string
	ProviderCN      string
	ProviderCountry string
	OperatorName    string
	OperatorCN      string
	OperatorCountry string
	OperatorType    string
	PlanFamily      string
	PlanCode        string
	PlanName        string
	Tier            string
	BillingCycle    string
	Currency        string
	ListPrice       float64
	PriceUnit       string
	QuotaValue      int64
	QuotaUnit       string
	ContextWindow   int
	PlanScope       string
	ModelScope      string
	SourceURL       string
	PublishedAt     string
	EffectiveDate   string
	Notes           string
}

func main() {
	loadImportProjectEnv()

	var rawURL string
	var fixturePath string
	var dryRun bool
	var timeoutSeconds int

	flag.StringVar(&rawURL, "url", defaultTencentCatalogURL, "腾讯云公开目录 URL")
	flag.StringVar(&fixturePath, "fixture", "", "本地 HTML/Text 样例文件，优先用于离线导入")
	flag.BoolVar(&dryRun, "dry-run", false, "仅解析并打印摘要，不写入数据库")
	flag.IntVar(&timeoutSeconds, "timeout", int(defaultTencentCatalogTimeout/time.Second), "请求超时（秒）")
	flag.Parse()

	cfg := importTencentSubscriptionConfig{
		URL:     rawURL,
		Fixture: fixturePath,
		DryRun:  dryRun,
		Timeout: time.Duration(timeoutSeconds) * time.Second,
	}

	var db *sql.DB
	var err error
	if !cfg.DryRun {
		dsn := os.Getenv("DATABASE_URL")
		if dsn == "" {
			dsn = "postgres://long@/llm_intelligence?host=/var/run/postgresql"
		}
		db, err = sql.Open("postgres", dsn)
		if err != nil {
			fmt.Fprintf(os.Stderr, "open db: %v\n", err)
			os.Exit(1)
		}
		defer db.Close()
	}

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

func loadImportProjectEnv() {
	for _, path := range []string{".env.local", ".env"} {
		loadImportEnvFile(path)
	}
}

func loadImportEnvFile(path string) {
	data, err := os.ReadFile(path)
	if err != nil {
		return
	}

	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 runTencentSubscriptionImport(cfg importTencentSubscriptionConfig, db *sql.DB, out io.Writer) error {
	raw, err := fetchTencentCatalogContent(fetchTencentCatalogConfig{
		URL:     cfg.URL,
		DryRun:  cfg.DryRun,
		Timeout: cfg.Timeout,
		Fixture: cfg.Fixture,
	}, &http.Client{Timeout: cfg.Timeout})
	if err != nil {
		return err
	}

	catalog, err := parseTencentCatalog(raw)
	if err != nil {
		return err
	}

	plans := buildSubscriptionPlans(catalog, cfg.URL)
	if cfg.DryRun {
		_, err = fmt.Fprintf(
			out,
			"source=tencent-subscription-import updated_at=%s plans=%d provider=%s operator=%s dry_run=true\n",
			catalog.UpdatedAt,
			len(plans),
			plans[0].ProviderName,
			plans[0].OperatorName,
		)
		return err
	}

	if db == nil {
		return fmt.Errorf("db is required when dry-run=false")
	}

	if err := upsertSubscriptionPlans(db, plans); err != nil {
		return err
	}

	var tableRows int
	if err := db.QueryRow(`SELECT COUNT(*) FROM subscription_plan`).Scan(&tableRows); err != nil {
		return fmt.Errorf("count subscription_plan: %w", err)
	}

	summary := fmt.Sprintf(
		"source=tencent-subscription-import updated_at=%s plans=%d provider=%s operator=%s table_rows=%d dry_run=false\n",
		catalog.UpdatedAt,
		len(plans),
		plans[0].ProviderName,
		plans[0].OperatorName,
		tableRows,
	)
	if _, err := io.WriteString(out, summary); err != nil {
		return err
	}
	if err := writeTencentImportSummary(summary); err != nil {
		return err
	}
	return nil
}

func buildSubscriptionPlans(catalog tencentCatalog, sourceURL string) []subscriptionPlanRow {
	modelsBySeries := make(map[string][]tencentModel)
	for _, model := range catalog.Models {
		modelsBySeries[model.Series] = append(modelsBySeries[model.Series], model)
	}

	plans := make([]subscriptionPlanRow, 0, len(catalog.Plans))
	for _, plan := range catalog.Plans {
		models := modelsBySeries[plan.Series]
		plans = append(plans, subscriptionPlanRow{
			ProviderName:    "Tencent",
			ProviderCN:      "腾讯",
			ProviderCountry: "CN",
			OperatorName:    "Tencent Cloud",
			OperatorCN:      "腾讯云",
			OperatorCountry: "CN",
			OperatorType:    "cloud",
			PlanFamily:      inferPlanFamily(plan.Series),
			PlanCode:        slugifyPlanCode(plan.Series, plan.Tier),
			PlanName:        fmt.Sprintf("%s %s", plan.Series, plan.Tier),
			Tier:            plan.Tier,
			BillingCycle:    normalizeBillingCycle(plan.BillingCycle),
			Currency:        "CNY",
			ListPrice:       parsePlanPrice(plan.Price),
			PriceUnit:       "CNY/month",
			QuotaValue:      parseQuotaValue(plan.Quota),
			QuotaUnit:       "tokens/month",
			ContextWindow:   maxContextWindow(models),
			PlanScope:       plan.Series,
			ModelScope:      encodeModelScope(models),
			SourceURL:       sourceURL,
			PublishedAt:     catalog.UpdatedAt,
			EffectiveDate:   extractEffectiveDate(catalog.UpdatedAt),
			Notes:           strings.TrimSpace(plan.Scene),
		})
	}
	return plans
}

func inferPlanFamily(series string) string {
	lower := strings.ToLower(series)
	if strings.Contains(lower, "coding plan") {
		return "coding_plan"
	}
	return "token_plan"
}

func slugifyPlanCode(series string, tier string) string {
	seriesCode := strings.TrimSpace(series)
	switch seriesCode {
	case "通用 Token Plan":
		seriesCode = "token-plan"
	case "Hy Token Plan":
		seriesCode = "hy-token-plan"
	}

	raw := strings.ToLower(strings.TrimSpace(seriesCode + "-" + tier))
	replacer := strings.NewReplacer(" ", "-", "/", "-", "_", "-", ".", "-", "（", "", "）", "", "(", "", ")", "", ":", "-", "--", "-")
	raw = replacer.Replace(raw)
	raw = strings.Trim(raw, "-")
	return raw
}

func normalizeBillingCycle(raw string) string {
	if strings.Contains(raw, "月") {
		return "monthly"
	}
	return strings.TrimSpace(raw)
}

func parsePlanPrice(raw string) float64 {
	value := strings.TrimSpace(strings.TrimSuffix(raw, "元/月"))
	f, _ := strconv.ParseFloat(value, 64)
	return f
}

func parseQuotaValue(raw string) int64 {
	quotaPattern := regexp.MustCompile(`([\d.]+)\s*([万亿]?)\s*Tokens`)
	matches := quotaPattern.FindStringSubmatch(raw)
	if len(matches) != 3 {
		return 0
	}
	base, _ := strconv.ParseFloat(matches[1], 64)
	switch matches[2] {
	case "万":
		base *= 10000
	case "亿":
		base *= 100000000
	}
	return int64(base)
}

func maxContextWindow(models []tencentModel) int {
	max := 0
	for _, model := range models {
		if model.ContextLength > max {
			max = model.ContextLength
		}
	}
	return max
}

func encodeModelScope(models []tencentModel) string {
	ids := make([]string, 0, len(models))
	for _, model := range models {
		ids = append(ids, model.ModelID)
	}
	data, _ := json.Marshal(ids)
	return string(data)
}

func extractEffectiveDate(updatedAt string) string {
	if len(updatedAt) >= len("2006-01-02") {
		return updatedAt[:10]
	}
	return time.Now().Format("2006-01-02")
}

func upsertSubscriptionPlans(db *sql.DB, plans []subscriptionPlanRow) error {
	providerID, err := ensureModelProvider(db, plans[0])
	if err != nil {
		return err
	}
	operatorID, err := ensureOperator(db, plans[0])
	if err != nil {
		return err
	}

	for _, plan := range plans {
		publishedAt, err := time.Parse("2006-01-02 15:04:05", plan.PublishedAt)
		if err != nil {
			return fmt.Errorf("parse published_at for %s: %w", plan.PlanCode, err)
		}
		effectiveDate, err := time.Parse("2006-01-02", plan.EffectiveDate)
		if err != nil {
			return fmt.Errorf("parse effective_date for %s: %w", plan.PlanCode, err)
		}

		_, err = db.Exec(
			`INSERT INTO subscription_plan (
				provider_id, operator_id, plan_family, plan_code, plan_name, tier,
				billing_cycle, currency, list_price, price_unit, quota_value, quota_unit,
				context_window, plan_scope, model_scope, source_url, published_at, effective_date, notes
			) VALUES (
				$1, $2, $3, $4, $5, $6,
				$7, $8, $9, $10, $11, $12,
				$13, $14, $15, $16, $17, $18, $19
			)
			ON CONFLICT (provider_id, plan_code, effective_date)
			DO UPDATE SET
				operator_id = EXCLUDED.operator_id,
				plan_family = EXCLUDED.plan_family,
				plan_name = EXCLUDED.plan_name,
				tier = EXCLUDED.tier,
				billing_cycle = EXCLUDED.billing_cycle,
				currency = EXCLUDED.currency,
				list_price = EXCLUDED.list_price,
				price_unit = EXCLUDED.price_unit,
				quota_value = EXCLUDED.quota_value,
				quota_unit = EXCLUDED.quota_unit,
				context_window = EXCLUDED.context_window,
				plan_scope = EXCLUDED.plan_scope,
				model_scope = EXCLUDED.model_scope,
				source_url = EXCLUDED.source_url,
				published_at = EXCLUDED.published_at,
				notes = EXCLUDED.notes,
				updated_at = CURRENT_TIMESTAMP`,
			providerID, operatorID, plan.PlanFamily, plan.PlanCode, plan.PlanName, plan.Tier,
			plan.BillingCycle, plan.Currency, plan.ListPrice, plan.PriceUnit, plan.QuotaValue, plan.QuotaUnit,
			nullIfZero(plan.ContextWindow), plan.PlanScope, plan.ModelScope, plan.SourceURL, publishedAt, effectiveDate, plan.Notes,
		)
		if err != nil {
			return fmt.Errorf("upsert subscription_plan %s: %w", plan.PlanCode, err)
		}
	}

	return nil
}

func ensureModelProvider(db *sql.DB, plan subscriptionPlanRow) (int64, error) {
	var providerID int64
	err := db.QueryRow(`SELECT id FROM model_provider WHERE name = $1`, plan.ProviderName).Scan(&providerID)
	if err == nil {
		return providerID, nil
	}
	if err != sql.ErrNoRows {
		return 0, err
	}

	err = db.QueryRow(
		`INSERT INTO model_provider (name, name_cn, country, website, status)
		 VALUES ($1, $2, $3, $4, 'active')
		 RETURNING id`,
		plan.ProviderName, plan.ProviderCN, plan.ProviderCountry, "https://cloud.tencent.com",
	).Scan(&providerID)
	return providerID, err
}

func ensureOperator(db *sql.DB, plan subscriptionPlanRow) (int64, error) {
	var operatorID int64
	err := db.QueryRow(`SELECT id FROM operator WHERE name = $1`, plan.OperatorName).Scan(&operatorID)
	if err == nil {
		return operatorID, nil
	}
	if err != sql.ErrNoRows {
		return 0, err
	}

	err = db.QueryRow(
		`INSERT INTO operator (name, name_cn, country, website, description, status, type)
		 VALUES ($1, $2, $3, $4, $5, 'active', $6)
		 RETURNING id`,
		plan.OperatorName, plan.OperatorCN, plan.OperatorCountry, "https://cloud.tencent.com",
		"Tencent Cloud subscription plans", plan.OperatorType,
	).Scan(&operatorID)
	return operatorID, err
}

func nullIfZero(value int) any {
	if value == 0 {
		return nil
	}
	return value
}

func writeTencentImportSummary(summary string) error {
	const summaryPath = "reports/verification/tencent_subscription_import_latest.txt"
	if err := os.MkdirAll("reports/verification", 0755); err != nil {
		return err
	}
	return os.WriteFile(summaryPath, []byte(summary), 0644)
}