//go:build llm_script

package main

import (
	"database/sql"
	"flag"
	"fmt"
	"html"
	"io"
	"net/http"
	"os"
	"regexp"
	"strings"
	"time"
)

const defaultHunyuanPricingURL = "https://cloud.tencent.com/document/product/1729/97731"

var hunyuanModelLinePattern = regexp.MustCompile(`^[A-Za-z0-9 ._-]+$`)

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

func main() {
	loadSubscriptionImportEnv()

	var url string
	var fixture string
	var dryRun bool
	var timeoutSeconds int

	flag.StringVar(&url, "url", defaultHunyuanPricingURL, "腾讯混元官方价格页")
	flag.StringVar(&fixture, "fixture", "", "腾讯混元价格样例文件")
	flag.BoolVar(&dryRun, "dry-run", false, "仅解析并打印摘要，不写入数据库")
	flag.IntVar(&timeoutSeconds, "timeout", 20, "请求超时（秒）")
	flag.Parse()

	cfg := hunyuanPricingImportConfig{URL: url, Fixture: fixture, DryRun: dryRun, Timeout: time.Duration(timeoutSeconds) * time.Second}

	var db *sql.DB
	var err error
	if !cfg.DryRun {
		db, err = subscriptionImportDB()
		if err != nil {
			fmt.Fprintf(os.Stderr, "open db: %v\n", err)
			os.Exit(1)
		}
		defer db.Close()
	}

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

func runHunyuanPricingImport(cfg hunyuanPricingImportConfig, db *sql.DB, out io.Writer) error {
	client := &http.Client{Timeout: cfg.Timeout}
	raw, err := fetchRawPricingPage(cfg.URL, cfg.Fixture, client)
	if err != nil {
		return err
	}
	records, err := parseHunyuanPricingCatalog(raw)
	if err != nil {
		return err
	}
	records = dedupeOfficialPricingRecords(records)
	if cfg.DryRun {
		_, err = fmt.Fprintf(out, "source=hunyuan-pricing-import models=%d operator=%s dry_run=true\n", len(records), records[0].OperatorName)
		return err
	}
	if db == nil {
		return fmt.Errorf("db is required when dry-run=false")
	}
	if err := upsertOfficialPricingRecords(db, records, "hunyuan-pricing-import"); err != nil {
		return err
	}
	var tableRows int
	if err := db.QueryRow(`SELECT COUNT(*) FROM region_pricing`).Scan(&tableRows); err != nil {
		return fmt.Errorf("count region_pricing: %w", err)
	}
	_, err = fmt.Fprintf(out, "source=hunyuan-pricing-import models=%d operator=%s table_rows=%d dry_run=false\n", len(records), records[0].OperatorName, tableRows)
	return err
}

func parseHunyuanPricingCatalog(raw string) ([]officialPricingRecord, error) {
	lines := hunyuanPricingLines(raw)
	records := make([]officialPricingRecord, 0)
	currentModel := ""
	currentInput := 0.0
	for _, line := range lines {
		trimmed := strings.TrimSpace(line)
		switch {
		case trimmed == "" || strings.Contains(trimmed, "混元生文价格说明") || strings.Contains(trimmed, "token 后付费") ||
			strings.Contains(trimmed, "产品名") || strings.Contains(trimmed, "输入长度") || strings.Contains(trimmed, "免费额度"):
			continue
		case strings.HasPrefix(trimmed, "输入："):
			currentInput = mustParseSubscriptionPrice(strings.TrimSuffix(strings.TrimPrefix(trimmed, "输入："), "元"))
		case strings.HasPrefix(trimmed, "输出："):
			if currentModel == "" || currentInput == 0 {
				continue
			}
			outputPrice := mustParseSubscriptionPrice(strings.TrimSuffix(strings.TrimPrefix(trimmed, "输出："), "元"))
			providerNameCn, providerCountry, providerWebsite := providerMetadata("Tencent")
			records = append(records, officialPricingRecord{
				ModelID:         normalizeExternalID("hunyuan", currentModel),
				ModelName:       currentModel,
				ProviderName:    "Tencent",
				ProviderNameCn:  providerNameCn,
				ProviderCountry: providerCountry,
				ProviderWebsite: providerWebsite,
				OperatorName:    "Tencent Hunyuan",
				OperatorNameCn:  "腾讯混元",
				OperatorCountry: "CN",
				OperatorWebsite: "https://cloud.tencent.com/product/hunyuan",
				OperatorType:    "official",
				Region:          "CN",
				Currency:        "CNY",
				InputPrice:      currentInput,
				OutputPrice:     outputPrice,
				SourceURL:       defaultHunyuanPricingURL,
				ModelSourceURL:  defaultHunyuanPricingURL,
				DateConfidence:  "unknown",
				DateSourceKind:  "official_pricing",
				Modality:        detectModality(currentModel),
			})
			currentModel = ""
			currentInput = 0
		case hunyuanModelLinePattern.MatchString(trimmed) && !strings.Contains(trimmed, "元") && !strings.Contains(trimmed, "tokens") && trimmed != "-":
			currentModel = trimmed
			currentInput = 0
		}
	}
	if len(records) == 0 {
		return nil, fmt.Errorf("unexpected hunyuan pricing content")
	}
	return records, nil
}

func hunyuanPricingLines(raw string) []string {
	raw = strings.ReplaceAll(raw, `\u003c`, "<")
	raw = strings.ReplaceAll(raw, `\u003e`, ">")
	raw = strings.ReplaceAll(raw, `\n`, "\n")
	raw = strings.ReplaceAll(raw, `\t`, " ")
	raw = html.UnescapeString(raw)
	replacer := strings.NewReplacer(
		"<br>", "\n", "<br/>", "\n", "<br />", "\n",
		"</p>", "\n", "</div>", "\n", "</section>", "\n", "</tr>", "\n",
		"</td>", "\n", "</th>", "\n", "</li>", "\n", "</h1>", "\n",
		"</h2>", "\n", "</h3>", "\n", "</h4>", "\n", "</h5>", "\n", "</h6>", "\n",
	)
	withBreaks := replacer.Replace(raw)
	withBreaks = regexp.MustCompile(`(?is)<[^>]+>`).ReplaceAllString(withBreaks, " ")
	parts := strings.Split(withBreaks, "\n")
	lines := make([]string, 0, len(parts))
	for _, part := range parts {
		line := strings.TrimSpace(regexp.MustCompile(`\s+`).ReplaceAllString(part, " "))
		if line != "" {
			lines = append(lines, line)
		}
	}
	return lines
}