package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"strings"
	"time"

	sdk "gitcode.com/JianFeeeee/homeagent-sdk/sdk"
)

type Plugin struct {
	name    string
	sdk     *sdk.PluginSDK
	client  *http.Client
	apiKey  string
	provider string
	model   string
	size    string
	baseURL string
}

func NewPluginFactory(name string, config map[string]interface{}) (sdk.Plugin, error) {
	return &Plugin{name: name}, nil
}

func (p *Plugin) Name() string { return p.name }

func getSetting[T string | int64 | float64](s sdk.SettingsAPI, key string, def T) T {
	v, err := s.Get(key)
	if err != nil || v == nil {
		return def
	}
	switch any(def).(type) {
	case string:
		if sv, ok := v.(string); ok {
			return any(sv).(T)
		}
	case int64:
		switch n := v.(type) {
		case float64:
			return any(int64(n)).(T)
		case int64:
			return any(n).(T)
		case string:
			if i, err := strconv.ParseInt(n, 10, 64); err == nil {
				return any(i).(T)
			}
		}
	case float64:
		switch n := v.(type) {
		case float64:
			return any(n).(T)
		case int64:
			return any(float64(n)).(T)
		case string:
			if f, err := strconv.ParseFloat(n, 64); err == nil {
				return any(f).(T)
			}
		}
	}
	return def
}

func getArg[T string | int64 | float64](args map[string]interface{}, key string, def T) T {
	v, ok := args[key]
	if !ok || v == nil {
		return def
	}
	switch any(def).(type) {
	case string:
		if s, ok := v.(string); ok {
			return any(s).(T)
		}
	case int64:
		switch n := v.(type) {
		case float64:
			return any(int64(n)).(T)
		case int64:
			return any(n).(T)
		case string:
			if i, err := strconv.ParseInt(n, 10, 64); err == nil {
				return any(i).(T)
			}
		}
	case float64:
		switch n := v.(type) {
		case float64:
			return any(n).(T)
		case int64:
			return any(float64(n)).(T)
		case string:
			if f, err := strconv.ParseFloat(n, 64); err == nil {
				return any(f).(T)
			}
		}
	}
	return def
}

func (p *Plugin) Start(s *sdk.PluginSDK) error {
	s.SetAutoRestart(true)
	p.sdk = s
	p.client = &http.Client{Timeout: 120 * time.Second}

	s.Settings().RegisterDef(sdk.ConfigDef{
		Key: "api_key", Default: "", Type: "string",
		DisplayName: "API Key", Description: "OpenAI / Stable Diffusion API Key",
		Category: "ai_image", Secret: true,
	})
	s.Settings().RegisterDef(sdk.ConfigDef{
		Key: "base_url", Default: "", Type: "string",
		DisplayName: "Base URL", Description: "自定义 OpenAI 兼容网关地址（不带 /v1 尾缀，如 http://127.0.0.1:8081）；为空走官方 https://api.openai.com",
		Category:    "ai_image",
	})
	s.Settings().RegisterDef(sdk.ConfigDef{
		Key: "provider", Default: "openai", Type: "string",
		DisplayName: "Provider", Description: "Image generation provider: openai / stability",
		Category:    "ai_image",
	})
	s.Settings().RegisterDef(sdk.ConfigDef{
		Key: "model", Default: "dall-e-3", Type: "string",
		DisplayName: "Model", Description: "Model name (dall-e-3, sd-xl, etc.)",
		Category: "ai_image",
	})
	s.Settings().RegisterDef(sdk.ConfigDef{
		Key: "size", Default: "1024x1024", Type: "string",
		DisplayName: "Size", Description: "Default image size (1024x1024, 1024x1792, 1792x1024)",
		Category: "ai_image",
	})

	p.apiKey = getSetting(s.Settings(), "api_key", "")
	p.provider = getSetting(s.Settings(), "provider", "openai")
	p.model = getSetting(s.Settings(), "model", "dall-e-3")
	p.size = getSetting(s.Settings(), "size", "1024x1024")
	p.baseURL = strings.TrimRight(strings.TrimSpace(getSetting(s.Settings(), "base_url", "")), "/")

	tp := p.name + "_"
	s.RegisterTool(tp+"generate", sdk.ToolDef{
		Name: tp + "generate", Description: "Generate image from text prompt using AI. Returns image URL.",
		Parameters: map[string]interface{}{
			"type": "object",
			"properties": map[string]interface{}{
				"prompt": map[string]interface{}{"type": "string", "description": "Text description of the image to generate"},
				"size":   map[string]interface{}{"type": "string", "description": "Image size (1024x1024, 1024x1792, 1792x1024), default from config"},
				"model":  map[string]interface{}{"type": "string", "description": "Model override (dall-e-3, dall-e-2)"},
				"n":      map[string]interface{}{"type": "integer", "description": "Number of images to generate (1-10), default 1"},
			},
			"required": []string{"prompt"},
		},
	}, p.handleGenerate)

	fmt.Printf("[%s] started (provider=%s, model=%s)\n", p.name, p.provider, p.model)
	return nil
}

func (p *Plugin) Stop() error {
	fmt.Printf("[%s] stopped\n", p.name)
	return nil
}

type openAIReq struct {
	Model          string `json:"model"`
	Prompt         string `json:"prompt"`
	N              int    `json:"n"`
	Size           string `json:"size"`
	ResponseFormat string `json:"response_format"`
}

type openAIResp struct {
	Created int64 `json:"created"`
	Data    []struct {
		RevisedPrompt string `json:"revised_prompt"`
		URL           string `json:"url"`
	} `json:"data"`
	Error *struct {
		Message string `json:"message"`
		Type    string `json:"type"`
	} `json:"error"`
}

func (p *Plugin) handleGenerate(args map[string]interface{}) (interface{}, error) {
	prompt := getArg(args, "prompt", "")
	if prompt == "" {
		return map[string]interface{}{"isError": true, "content": "prompt is required"}, nil
	}

	key := getSetting(p.sdk.Settings(), "api_key", p.apiKey)
	if key == "" {
		return map[string]interface{}{"isError": true, "content": "API key not configured. Set plugin.ai_image.api_key via CLI."}, nil
	}

	provider := getSetting(p.sdk.Settings(), "provider", p.provider)
	model := getArg(args, "model", getSetting(p.sdk.Settings(), "model", p.model))
	size := getArg(args, "size", getSetting(p.sdk.Settings(), "size", p.size))
	n := getArg(args, "n", int64(1))
	if n < 1 {
		n = 1
	}
	if n > 10 {
		n = 10
	}

	switch provider {
	case "openai":
		return p.generateOpenAI(prompt, model, size, int(n), key)
	case "stability":
		return p.generateStability(prompt, model, size, int(n), key)
	default:
		return map[string]interface{}{"isError": true, "content": "Unknown provider: " + provider + ". Supported: openai, stability"}, nil
	}
}

func (p *Plugin) generateOpenAI(prompt, model, size string, n int, apiKey string) (interface{}, error) {
	// 上游地址：base_url 非空时走自定义网关（如本机 llmsproxy），约定不带 /v1 尾缀；
	// 为空保持官方直连。兼容误配了 /v1 尾缀的情况（去重）。
	endpoint := "https://api.openai.com/v1/images/generations"
	if p.baseURL != "" {
		base := strings.TrimSuffix(p.baseURL, "/v1")
		endpoint = base + "/v1/images/generations"
	}

	body := openAIReq{
		Model:          model,
		Prompt:         prompt,
		N:              n,
		Size:           size,
		ResponseFormat: "url",
	}

	b, _ := json.Marshal(body)
	req, _ := http.NewRequest("POST", endpoint, bytes.NewReader(b))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+apiKey)

	resp, err := p.client.Do(req)
	if err != nil {
		return map[string]interface{}{"isError": true, "content": "Request failed: " + err.Error()}, nil
	}
	defer resp.Body.Close()

	respBody, _ := io.ReadAll(resp.Body)
	var result openAIResp
	if err := json.Unmarshal(respBody, &result); err != nil {
		return map[string]interface{}{"isError": true, "content": "Failed to parse response: " + err.Error()}, nil
	}

	if result.Error != nil {
		return map[string]interface{}{"isError": true, "content": "API error: " + result.Error.Message}, nil
	}

	if len(result.Data) == 0 {
		return map[string]interface{}{"isError": true, "content": "No images returned"}, nil
	}

	urls := make([]string, len(result.Data))
	for i, d := range result.Data {
		urls[i] = d.URL
	}

	return map[string]interface{}{
		"content": fmt.Sprintf("Generated %d image(s) with model %s:\n%s", len(urls), model, strings.Join(urls, "\n")),
		"images":  urls,
		"prompt":  prompt,
		"model":   model,
	}, nil
}

type stabilityReq struct {
	TextPrompts []stabilityPrompt `json:"text_prompts"`
	Width       int               `json:"width"`
	Height      int               `json:"height"`
	Samples     int               `json:"samples"`
}

type stabilityPrompt struct {
	Text   string  `json:"text"`
	Weight float64 `json:"weight,omitempty"`
}

type stabilityArtifact struct {
	Base64 string `json:"base64"`
	Seed   int    `json:"seed"`
}

type stabilityResp struct {
	Artifacts []stabilityArtifact `json:"artifacts"`
	Message   string              `json:"message,omitempty"`
}

func (p *Plugin) generateStability(prompt, model, size string, n int, apiKey string) (interface{}, error) {
	width, height := 1024, 1024
	if parts := strings.Split(size, "x"); len(parts) == 2 {
		if w, err := strconv.Atoi(parts[0]); err == nil {
			width = w
		}
		if h, err := strconv.Atoi(parts[1]); err == nil {
			height = h
		}
	}

	body := stabilityReq{
		TextPrompts: []stabilityPrompt{{Text: prompt, Weight: 1.0}},
		Width:       width,
		Height:      height,
		Samples:     n,
	}

	apiURL := "https://api.stability.ai/v1/generation/stable-diffusion-xl-1024-v1-0/text-to-image"

	b, _ := json.Marshal(body)
	req, _ := http.NewRequest("POST", apiURL, bytes.NewReader(b))
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("Authorization", "Bearer "+apiKey)
	req.Header.Set("Accept", "application/json")

	resp, err := p.client.Do(req)
	if err != nil {
		return map[string]interface{}{"isError": true, "content": "Request failed: " + err.Error()}, nil
	}
	defer resp.Body.Close()

	if resp.StatusCode != 200 {
		respBody, _ := io.ReadAll(resp.Body)
		return map[string]interface{}{"isError": true, "content": fmt.Sprintf("API error (status %d): %s", resp.StatusCode, string(respBody))}, nil
	}

	respBody, _ := io.ReadAll(resp.Body)
	var result stabilityResp
	if err := json.Unmarshal(respBody, &result); err != nil {
		return map[string]interface{}{"isError": true, "content": "Failed to parse response: " + err.Error()}, nil
	}

	if len(result.Artifacts) == 0 {
		msg := result.Message
		if msg == "" {
			msg = "No images returned"
		}
		return map[string]interface{}{"isError": true, "content": msg}, nil
	}

	urls := make([]string, len(result.Artifacts))
	for i, a := range result.Artifacts {
		urls[i] = "data:image/png;base64," + a.Base64
	}

	return map[string]interface{}{
		"content": fmt.Sprintf("Generated %d image(s) via Stability AI:\n%s", len(urls), strings.Join(urls, "\n")),
		"images":  urls,
		"prompt":  prompt,
		"model":   model,
	}, nil
}