//go:build llm_script

package main

import (
	"fmt"
	"regexp"
	"strings"
)

const (
	defaultPerplexityPricingFetchURL  = "https://docs.perplexity.ai/docs/agent-api/models.md"
	defaultPerplexityPricingSourceURL = "https://docs.perplexity.ai/docs/agent-api/models"
)

var markdownLinkPattern = regexp.MustCompile(`\[(.*?)\]\((https://[^)]+)\)`)

func parsePerplexityPricingCatalog(raw string) ([]officialPricingRecord, error) {
	lines := strings.Split(raw, "\n")
	records := make([]officialPricingRecord, 0)
	header := []string(nil)
	modelIndex := -1
	inputIndex := -1
	outputIndex := -1
	docIndex := -1
	for _, line := range lines {
		line = strings.TrimSpace(line)
		if !strings.HasPrefix(line, "|") {
			continue
		}

		parts := splitMarkdownTableRow(line)
		if len(parts) == 0 {
			continue
		}
		if header == nil {
			header = parts
			modelIndex, inputIndex, outputIndex, docIndex = detectPerplexityTableColumns(parts)
			continue
		}
		if isMarkdownTableSeparator(parts) {
			continue
		}
		if modelIndex < 0 || inputIndex < 0 || outputIndex < 0 || modelIndex >= len(parts) || inputIndex >= len(parts) || outputIndex >= len(parts) {
			continue
		}

		modelPath := strings.Trim(parts[modelIndex], "`")
		inputCell := parts[inputIndex]
		outputCell := parts[outputIndex]
		inputPrice, ok := firstDollarPrice(inputCell)
		if !ok {
			continue
		}
		outputPrice, ok := firstDollarPrice(outputCell)
		if !ok {
			continue
		}
		sourceURL := defaultPerplexityPricingSourceURL
		if docIndex >= 0 && docIndex < len(parts) {
			if matches := markdownLinkPattern.FindStringSubmatch(parts[docIndex]); len(matches) == 3 {
				sourceURL = matches[2]
			}
		}
		providerName := providerFromModelPath(modelPath)
		providerNameCn, providerCountry, providerWebsite := providerMetadata(providerName)
		record := officialPricingRecord{
			ModelID:         normalizeExternalID("perplexity", modelPath),
			ModelName:       modelPath,
			ProviderName:    providerName,
			ProviderNameCn:  providerNameCn,
			ProviderCountry: providerCountry,
			ProviderWebsite: providerWebsite,
			OperatorName:    "Perplexity API",
			OperatorNameCn:  "Perplexity API",
			OperatorCountry: "US",
			OperatorWebsite: "https://docs.perplexity.ai",
			OperatorType:    "relay",
			Region:          "global",
			Currency:        "USD",
			InputPrice:      inputPrice,
			OutputPrice:     outputPrice,
			SourceURL:       defaultPerplexityPricingSourceURL,
			ModelSourceURL:  sourceURL,
			DateConfidence:  "unknown",
			DateSourceKind:  "official_pricing",
			Modality:        detectModality(modelPath),
		}
		record.IsFree = record.InputPrice == 0 && record.OutputPrice == 0
		records = append(records, record)
	}
	if len(records) == 0 {
		return nil, fmt.Errorf("unexpected perplexity pricing content")
	}
	return records, nil
}

func splitMarkdownTableRow(line string) []string {
	trimmed := strings.TrimSpace(line)
	trimmed = strings.TrimPrefix(trimmed, "|")
	trimmed = strings.TrimSuffix(trimmed, "|")
	if trimmed == "" {
		return nil
	}
	parts := strings.Split(trimmed, "|")
	result := make([]string, 0, len(parts))
	for _, part := range parts {
		result = append(result, strings.TrimSpace(part))
	}
	return result
}

func detectPerplexityTableColumns(header []string) (int, int, int, int) {
	modelIndex := -1
	inputIndex := -1
	outputIndex := -1
	docIndex := -1
	for i, col := range header {
		lower := strings.ToLower(strings.TrimSpace(col))
		switch {
		case strings.Contains(lower, "model") && modelIndex == -1:
			modelIndex = i
		case strings.Contains(lower, "input") && (strings.Contains(lower, "price") || strings.Contains(lower, "$") || strings.Contains(lower, "/1m")) && inputIndex == -1:
		inputIndex = i
	case strings.Contains(lower, "output") && (strings.Contains(lower, "price") || strings.Contains(lower, "$") || strings.Contains(lower, "/1m")) && outputIndex == -1:
			outputIndex = i
		case (strings.Contains(lower, "documentation") || strings.Contains(lower, "docs")) && docIndex == -1:
			docIndex = i
		}
	}
	return modelIndex, inputIndex, outputIndex, docIndex
}

func isMarkdownTableSeparator(parts []string) bool {
	if len(parts) == 0 {
		return false
	}
	for _, part := range parts {
		trimmed := strings.TrimSpace(part)
		if trimmed == "" {
			return false
		}
		for _, ch := range trimmed {
			if ch != '-' && ch != ':' {
				return false
			}
		}
	}
	return true
}