package main

import (
	"embed"
	"fmt"
	"os"
	"strings"

	"github.com/voocel/ainovel-cli/app"
	"github.com/voocel/ainovel-cli/tools"
	"github.com/voocel/ainovel-cli/tui"
)

//go:embed prompts/*.md
var promptsFS embed.FS

//go:embed references
var referencesFS embed.FS

//go:embed styles/*.md
var stylesFS embed.FS

func main() {
	style := envOr("NOVEL_STYLE", "default")
	refs := loadReferences(style)
	prompts := loadPrompts()
	styles := loadStyles()
	cfg := buildConfig(style)

	prompt := parsePrompt()
	if prompt != "" {
		// CLI 模式：有命令行参数，直接运行
		cfg.Prompt = prompt
		if err := app.Run(cfg, refs, prompts, styles); err != nil {
			fmt.Fprintf(os.Stderr, "error: %v\n", err)
			os.Exit(1)
		}
		return
	}

	// TUI 模式：无命令行参数，启动交互界面
	if err := tui.Run(cfg, refs, prompts, styles); err != nil {
		fmt.Fprintf(os.Stderr, "error: %v\n", err)
		os.Exit(1)
	}
}

func buildConfig(style string) app.Config {
	provider := envOr("LLM_PROVIDER", "openrouter")
	apiKey := os.Getenv("Z_OPENAI_API_KEY")
	baseURL := os.Getenv("Z_OPENAI_BASE_URL")
	switch provider {
	case "anthropic":
		apiKey = envOr("ANTHROPIC_API_KEY", apiKey)
		baseURL = envOr("ANTHROPIC_BASE_URL", baseURL)
	case "gemini":
		apiKey = envOr("GEMINI_API_KEY", apiKey)
		baseURL = envOr("GEMINI_BASE_URL", baseURL)
	case "openrouter":
		apiKey = envOr("OPENROUTER_API_KEY", apiKey)
		baseURL = envOr("OPENROUTER_BASE_URL", "https://openrouter.ai/api/v1")
	}

	cfg := app.Config{
		NovelName: envOr("NOVEL_NAME", ""),
		Provider:  provider,
		APIKey:    apiKey,
		BaseURL:   baseURL,
		ModelName: envOr("LLM_MODEL", "stepfun/step-3.5-flash:free"),
		Style:     style,
	}
	return cfg
}

func parsePrompt() string {
	if len(os.Args) < 2 {
		return ""
	}
	if os.Args[1] == "-help" || os.Args[1] == "--help" || os.Args[1] == "-h" {
		printHelp()
		os.Exit(0)
	}
	return strings.Join(os.Args[1:], " ")
}

func printHelp() {
	fmt.Println(`ainovel-cli - AI 小说生成工具

用法:
  ainovel-cli [prompt]          CLI 模式：直接生成小说
  ainovel-cli                   TUI 模式：启动交互界面

环境变量:
  NOVEL_NAME        小说名称（默认：novel）
  NOVEL_STYLE       小说风格（默认：default）
                    可选值：
                      default   通用风格，叙事张弛有度，五感描写，对话自然
                      fantasy   奇幻冒险，世界观自然展开，魔法体系有代价感
                      romance   言情，情感递进有节奏，关系张力与内心描写并重
                      suspense  悬疑推理，多线叙事，信息差悬念，线索管理严谨
  LLM_PROVIDER      LLM 提供商：openrouter|anthropic|gemini（默认：openrouter）
  LLM_MODEL         模型名称（默认：stepfun/step-3.5-flash:free）

  Z_OPENAI_API_KEY  API 密钥
  Z_OPENAI_BASE_URL API 地址

  ANTHROPIC_API_KEY Anthropic API 密钥
  ANTHROPIC_BASE_URL Anthropic API 地址

  GEMINI_API_KEY    Gemini API 密钥
  GEMINI_BASE_URL   Gemini API 地址

  OPENROUTER_API_KEY OpenRouter API 密钥
  OPENROUTER_BASE_URL OpenRouter API 地址

示例:
  ainovel-cli "写一部科幻小说，主角是时间旅行者"
  NOVEL_NAME=时空之旅 ainovel-cli "写一部科幻小说"
  ainovel-cli  # 启动 TUI 交互模式`)
}

func loadReferences(style string) tools.References {
	refs := tools.References{
		ChapterGuide:      mustRead(referencesFS, "references/chapter-guide.md"),
		HookTechniques:    mustRead(referencesFS, "references/hook-techniques.md"),
		QualityChecklist:  mustRead(referencesFS, "references/quality-checklist.md"),
		OutlineTemplate:   mustRead(referencesFS, "references/outline-template.md"),
		CharacterTemplate: mustRead(referencesFS, "references/character-template.md"),
		ChapterTemplate:   mustRead(referencesFS, "references/chapter-template.md"),
		Consistency:       mustRead(referencesFS, "references/consistency.md"),
		ContentExpansion:  mustRead(referencesFS, "references/content-expansion.md"),
		DialogueWriting:   mustRead(referencesFS, "references/dialogue-writing.md"),
		LongformPlanning:  mustRead(referencesFS, "references/longform-planning.md"),
		Differentiation:   mustRead(referencesFS, "references/differentiation.md"),
	}
	if style != "" && style != "default" {
		path := "references/" + style + "/style-references.md"
		if data, err := referencesFS.ReadFile(path); err == nil {
			refs.StyleReference = string(data)
		}
	}
	return refs
}

func loadPrompts() app.Prompts {
	return app.Prompts{
		Coordinator:    mustRead(promptsFS, "prompts/coordinator.md"),
		ArchitectShort: mustRead(promptsFS, "prompts/architect-short.md"),
		ArchitectMid:   mustRead(promptsFS, "prompts/architect-mid.md"),
		ArchitectLong:  mustRead(promptsFS, "prompts/architect-long.md"),
		Writer:         mustRead(promptsFS, "prompts/writer.md"),
		Editor:         mustRead(promptsFS, "prompts/editor.md"),
	}
}

func mustRead(fs embed.FS, path string) string {
	data, err := fs.ReadFile(path)
	if err != nil {
		panic(fmt.Sprintf("embed read %s: %v", path, err))
	}
	return string(data)
}

func loadStyles() map[string]string {
	styles := make(map[string]string)
	entries, err := stylesFS.ReadDir("styles")
	if err != nil {
		return styles
	}
	for _, e := range entries {
		if e.IsDir() {
			continue
		}
		name := strings.TrimSuffix(e.Name(), ".md")
		data, err := stylesFS.ReadFile("styles/" + e.Name())
		if err != nil {
			continue
		}
		styles[name] = string(data)
	}
	return styles
}

func envOr(key, fallback string) string {
	if v := os.Getenv(key); v != "" {
		return v
	}
	return fallback
}