//go:build llm_script && !scripts_pkg

package main

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

const defaultQwenPricingURL = "https://help.aliyun.com/zh/model-studio/model-pricing"

var qwenModelLinePattern = regexp.MustCompile(`^(qwen[0-9a-z.-]+|qwq[0-9a-z.-]+|qvq[0-9a-z.-]+)$`)

type qwenPricingImportConfig 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", defaultQwenPricingURL, "通义千问官方模型价格页")
	flag.StringVar(&fixture, "fixture", "", "通义千问价格样例文件")
	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 := qwenPricingImportConfig{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 := runQwenPricingImport(cfg, db, os.Stdout); err != nil {
		fmt.Fprintf(os.Stderr, "import_qwen_pricing: %v\n", err)
		os.Exit(1)
	}
}

func runQwenPricingImport(cfg qwenPricingImportConfig, 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 := parseQwenPricingCatalog(raw)
	if err != nil {
		return err
	}
	records = dedupeOfficialPricingRecords(records)
	if cfg.DryRun {
		_, err = fmt.Fprintf(out, "source=qwen-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, "qwen-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=qwen-pricing-import models=%d operator=%s table_rows=%d dry_run=false\n", len(records), records[0].OperatorName, tableRows)
	return err
}

func parseQwenPricingCatalog(raw string) ([]officialPricingRecord, error) {
	lines := qwenPricingLines(raw)
	records := make([]officialPricingRecord, 0)
	for i := 0; i < len(lines); i++ {
		modelName := strings.ToLower(strings.TrimSpace(lines[i]))
		if !qwenModelLinePattern.MatchString(modelName) {
			continue
		}
		block := make([]string, 0, 12)
		for j := i + 1; j < len(lines) && j < i+14; j++ {
			next := strings.ToLower(strings.TrimSpace(lines[j]))
			if qwenModelLinePattern.MatchString(next) {
				break
			}
			block = append(block, lines[j])
		}
		prices := qwenBlockPrices(block)
		if len(prices) < 2 {
			continue
		}
		providerNameCn, providerCountry, providerWebsite := providerMetadata("Qwen")
		record := officialPricingRecord{
			ModelID:         normalizeExternalID("qwen", modelName),
			ModelName:       modelName,
			ProviderName:    "Qwen",
			ProviderNameCn:  providerNameCn,
			ProviderCountry: providerCountry,
			ProviderWebsite: providerWebsite,
			OperatorName:    "DashScope",
			OperatorNameCn:  "通义千问 API",
			OperatorCountry: "CN",
			OperatorWebsite: "https://help.aliyun.com/zh/model-studio/model-pricing",
			OperatorType:    "official",
			Region:          "CN",
			Currency:        "CNY",
			InputPrice:      prices[0],
			OutputPrice:     prices[1],
			SourceURL:       defaultQwenPricingURL,
			ModelSourceURL:  defaultQwenPricingURL,
			DateConfidence:  "unknown",
			DateSourceKind:  "official_pricing",
			Modality:        detectModality(modelName),
		}
		records = append(records, record)
	}
	if len(records) == 0 {
		return nil, fmt.Errorf("unexpected qwen pricing content")
	}
	return records, nil
}

func qwenPricingLines(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)
	tagPattern := regexp.MustCompile(`(?is)<[^>]+>`)
	withBreaks = tagPattern.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
}

func qwenBlockPrices(lines []string) []float64 {
	pricePattern := regexp.MustCompile(`^([0-9]+(?:\.[0-9]+)?) 元$`)
	prices := make([]float64, 0, 4)
	for _, line := range lines {
		match := pricePattern.FindStringSubmatch(strings.TrimSpace(line))
		if len(match) == 2 {
			prices = append(prices, mustParseSubscriptionPrice(match[1]))
		}
	}
	return prices
}