//go:build llm_script

package main

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

const defaultBytedanceArkPricingURL = "https://www.volcengine.com/docs/82379/1544106"

type bytedanceArkPricingImportConfig 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", defaultBytedanceArkPricingURL, "火山方舟官方模型价格页")
	flag.StringVar(&fixture, "fixture", "", "火山方舟价格样例文件")
	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 := bytedanceArkPricingImportConfig{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 := runBytedanceArkPricingImport(cfg, db, os.Stdout); err != nil {
		fmt.Fprintf(os.Stderr, "import_bytedance_pricing: %v\n", err)
		os.Exit(1)
	}
}

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

func parseBytedanceArkPricingCatalog(raw string) ([]officialPricingRecord, error) {
	markdown, err := extractBytedanceArkPricingMarkdown(raw)
	if err != nil {
		return nil, err
	}
	rows, err := extractMarkdownTableRowsForHeading(markdown, "## 在线推理（常规）")
	if err != nil {
		return nil, err
	}
	if len(rows) < 2 {
		return nil, fmt.Errorf("unexpected bytedance ark pricing table")
	}

	records := make([]officialPricingRecord, 0, len(rows)-1)
	for _, row := range rows[1:] {
		if len(row) < 6 {
			continue
		}
		modelName := cleanBytedanceArkCell(row[0])
		if modelName == "" || isBytedanceArkConditionRow(modelName) {
			continue
		}
		inputPrice := bytedanceArkPriceValue(row[2])
		outputPrice := bytedanceArkPriceValue(row[5])
		if inputPrice <= 0 || outputPrice <= 0 {
			continue
		}
		providerName := bytedanceArkProviderName(modelName)
		providerNameCn, providerCountry, providerWebsite := providerMetadata(providerName)
		records = append(records, officialPricingRecord{
			ModelID:         normalizeExternalID("bytedance", modelName),
			ModelName:       modelName,
			ProviderName:    providerName,
			ProviderNameCn:  providerNameCn,
			ProviderCountry: providerCountry,
			ProviderWebsite: providerWebsite,
			OperatorName:    "ByteDance Volcano",
			OperatorNameCn:  "火山引擎",
			OperatorCountry: "CN",
			OperatorWebsite: "https://www.volcengine.com/product/ark",
			OperatorType:    "official",
			Region:          "CN",
			Currency:        "CNY",
			InputPrice:      inputPrice,
			OutputPrice:     outputPrice,
			SourceURL:       defaultBytedanceArkPricingURL,
			ModelSourceURL:  defaultBytedanceArkPricingURL,
			DateConfidence:  "unknown",
			DateSourceKind:  "official_pricing",
			Modality:        detectModality(modelName),
		})
	}
	if len(records) == 0 {
		return nil, fmt.Errorf("no bytedance ark input/output pricing rows found")
	}
	return records, nil
}

func extractBytedanceArkPricingMarkdown(raw string) (string, error) {
	if !strings.Contains(raw, "window._ROUTER_DATA = ") {
		return raw, nil
	}
	jsonText, err := extractJSONAfterMarker(raw, "window._ROUTER_DATA = ")
	if err != nil {
		return "", err
	}
	var envelope map[string]any
	if err := json.Unmarshal([]byte(jsonText), &envelope); err != nil {
		return "", fmt.Errorf("parse bytedance router json: %w", err)
	}
	loaderData, _ := envelope["loaderData"].(map[string]any)
	page, _ := loaderData["docs/(libid)/(docid$)/page"].(map[string]any)
	curDoc, _ := page["curDoc"].(map[string]any)
	markdown, _ := curDoc["MDContent"].(string)
	if strings.TrimSpace(markdown) == "" {
		return "", fmt.Errorf("missing bytedance pricing markdown content")
	}
	return markdown, nil
}

func extractJSONAfterMarker(raw string, marker string) (string, error) {
	start := strings.Index(raw, marker)
	if start < 0 {
		return "", fmt.Errorf("marker %q not found", marker)
	}
	start += len(marker)
	braceDepth := 0
	inString := false
	escaped := false
	end := -1
	for i := start; i < len(raw); i++ {
		ch := raw[i]
		if inString {
			if escaped {
				escaped = false
				continue
			}
			switch ch {
			case '\\':
				escaped = true
			case '"':
				inString = false
			}
			continue
		}
		switch ch {
		case '"':
			inString = true
		case '{':
			braceDepth++
		case '}':
			braceDepth--
			if braceDepth == 0 {
				end = i + 1
				i = len(raw)
			}
		}
	}
	if end <= start {
		return "", fmt.Errorf("unable to locate router json boundary")
	}
	return raw[start:end], nil
}

func extractMarkdownTableRowsForHeading(markdown string, heading string) ([][]string, error) {
	lines := strings.Split(markdown, "\n")
	capturing := false
	rows := make([][]string, 0)
	for _, line := range lines {
		trimmed := strings.TrimSpace(line)
		switch {
		case trimmed == heading:
			capturing = true
		case capturing && strings.HasPrefix(trimmed, "#") && trimmed != heading:
			if len(rows) > 0 {
				return rows, nil
			}
			capturing = false
		}
		if !capturing || !strings.HasPrefix(trimmed, "|") || strings.Contains(trimmed, "|---") {
			continue
		}
		cells := strings.Split(strings.Trim(trimmed, "|"), "|")
		for i := range cells {
			cells[i] = strings.TrimSpace(cells[i])
		}
		rows = append(rows, cells)
	}
	if len(rows) == 0 {
		return nil, fmt.Errorf("missing markdown table for heading %s", heading)
	}
	return rows, nil
}

func cleanBytedanceArkCell(raw string) string {
	cleaned := html.UnescapeString(strings.TrimSpace(raw))
	cleaned = strings.ReplaceAll(cleaned, `\-`, "-")
	cleaned = strings.ReplaceAll(cleaned, `\`, "")
	cleaned = strings.ReplaceAll(cleaned, "<br><br>", " ")
	cleaned = strings.ReplaceAll(cleaned, "<br />", " ")
	cleaned = strings.ReplaceAll(cleaned, "<br/>", " ")
	cleaned = strings.ReplaceAll(cleaned, "<br>", " ")
	cleaned = regexp.MustCompile(`(?is)<[^>]+>`).ReplaceAllString(cleaned, " ")
	cleaned = regexp.MustCompile(`\s+`).ReplaceAllString(cleaned, " ")
	return strings.TrimSpace(cleaned)
}

func bytedanceArkPriceValue(raw string) float64 {
	cleaned := cleanBytedanceArkCell(raw)
	if cleaned == "" || strings.Contains(cleaned, "不支持") {
		return 0
	}
	match := regexp.MustCompile(`([0-9]+(?:\.[0-9]+)?)`).FindStringSubmatch(cleaned)
	if len(match) != 2 {
		return 0
	}
	return mustParseSubscriptionPrice(match[1])
}

func isBytedanceArkConditionRow(value string) bool {
	lower := strings.ToLower(strings.TrimSpace(value))
	return lower == "" || strings.HasPrefix(lower, "输入长度")
}

func bytedanceArkProviderName(modelName string) string {
	lower := strings.ToLower(strings.TrimSpace(modelName))
	switch {
	case strings.HasPrefix(lower, "deepseek"):
		return "DeepSeek"
	case strings.HasPrefix(lower, "glm"):
		return "Zhipu AI"
	default:
		return "ByteDance"
	}
}