package handler

import (
	"context"
	"net/http"
	"time"

	"github.com/gin-gonic/gin"

	"flowstack/internal/crypto"
	"flowstack/internal/database"
	"flowstack/internal/llm"
	"flowstack/internal/model"
)

// ListPipelines GET /api/pipelines —— 附带每条流水线最近一次运行信息
func ListPipelines(c *gin.Context) {
	var list []model.Pipeline
	database.DB.Order("updated_at DESC").Find(&list)

	// 每流水线最近一次 run（一次查询取全表后内存分组，数据量小；jianmu 用反规范化表，此处无需）
	var runs []model.PipelineRun
	database.DB.Order("started_at DESC").Limit(500).Find(&runs)
	lastByPipeline := make(map[uint]model.PipelineRun)
	for _, r := range runs {
		if _, ok := lastByPipeline[r.PipelineID]; !ok {
			lastByPipeline[r.PipelineID] = r
		}
	}

	type pipelineWithLastRun struct {
		model.Pipeline
		LastRun *model.PipelineRun `json:"lastRun"`
	}
	result := make([]pipelineWithLastRun, 0, len(list))
	for _, p := range list {
		item := pipelineWithLastRun{Pipeline: p}
		if r, ok := lastByPipeline[p.ID]; ok {
			item.LastRun = &r
		}
		result = append(result, item)
	}
	c.JSON(http.StatusOK, result)
}

// GetPipelineDetail GET /api/pipelines/:id —— 完整详情（编辑器各 Tab 数据源）
func GetPipelineDetail(c *gin.Context) {
	var p model.Pipeline
	if err := database.DB.First(&p, c.Param("id")).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "pipeline not found"})
		return
	}
	var nodes []model.PipelineNode
	database.DB.Where("pipeline_id = ?", p.ID).Order("position_x").Find(&nodes)
	var edges []model.PipelineEdge
	database.DB.Where("pipeline_id = ?", p.ID).Find(&edges)
	var lastRun model.PipelineRun
	hasRun := database.DB.Where("pipeline_id = ?", p.ID).Order("started_at DESC").First(&lastRun).Error == nil
	c.JSON(http.StatusOK, gin.H{
		"pipeline": p, "nodes": nodes, "edges": edges,
		"lastRun": func() *model.PipelineRun {
			if hasRun {
				return &lastRun
			}
			return nil
		}(),
	})
}

// GetSummary GET /api/summary —— 侧边栏徽标与首页统计
func GetSummary(c *gin.Context) {
	var buildNodes, plugins, running, pipelines, hosts, clusters int64
	database.DB.Model(&model.BuildNode{}).Count(&buildNodes)
	database.DB.Model(&model.Plugin{}).Count(&plugins)
	database.DB.Model(&model.PipelineRun{}).Where("status IN ('pending','queued','running')").Count(&running)
	database.DB.Model(&model.Pipeline{}).Count(&pipelines)
	database.DB.Model(&model.Host{}).Count(&hosts)
	database.DB.Model(&model.K8sCluster{}).Count(&clusters)
	c.JSON(http.StatusOK, gin.H{
		"buildNodes": buildNodes, "plugins": plugins, "running": running,
		"pipelines": pipelines, "hosts": hosts, "clusters": clusters,
	})
}

// GetSettings GET /api/settings —— 单行设置
func GetSettings(c *gin.Context) {
	var s model.SystemSetting
	if err := database.DB.First(&s, 1).Error; err != nil {
		s = model.SystemSetting{ID: 1, LlmEndpoint: "https://api.deepseek.com/v1", LlmModel: "deepseek-chat", LlmMaxTokens: 1200}
		database.DB.Create(&s)
	}
	s.LlmApiKeySet = s.LlmApiKey != ""
	c.JSON(http.StatusOK, s)
}

// UpdateSettings PUT /api/settings
func UpdateSettings(c *gin.Context) {
	var s model.SystemSetting
	if err := database.DB.First(&s, 1).Error; err != nil {
		s = model.SystemSetting{ID: 1}
		database.DB.Create(&s)
	}
	var body map[string]any
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	updates := map[string]any{"updated_at": time.Now()}
	if v, ok := body["theme"].(string); ok {
		updates["theme"] = v
	}
	if v, ok := body["notification"].(string); ok {
		updates["notification"] = v
	}
	if v, ok := body["toolMode"].(string); ok {
		updates["tool_mode"] = v
	}
	if v, ok := body["extra"].(string); ok {
		updates["extra"] = v
	}
	if v, ok := body["llmEnabled"].(bool); ok {
		updates["llm_enabled"] = v
	}
	if v, ok := body["llmEndpoint"].(string); ok {
		updates["llm_endpoint"] = v
	}
	if v, ok := body["llmModel"].(string); ok {
		updates["llm_model"] = v
	}
	if v, ok := body["llmMaxTokens"].(float64); ok {
		updates["llm_max_tokens"] = int(v)
	}
	// API Key 只写不读：非空才更新
	if v, ok := body["llmApiKey"].(string); ok && v != "" {
		enc, err := crypto.EncryptField(v)
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "API Key 加密失败"})
			return
		}
		updates["llm_api_key"] = enc
	}
	database.DB.Model(&s).Updates(updates)
	database.DB.First(&s, 1)
	s.LlmApiKeySet = s.LlmApiKey != ""
	c.JSON(http.StatusOK, s)
}

// TestLLM POST /api/settings/test-llm —— 用已保存配置做 ping 对话
func TestLLM(c *gin.Context) {
	var s model.SystemSetting
	if err := database.DB.First(&s, 1).Error; err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "请先保存设置"})
		return
	}
	if !s.LlmEnabled || s.LlmApiKey == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "AI 未启用或未配置 API Key"})
		return
	}
	apiKey := s.LlmApiKey
	if crypto.IsEncrypted(apiKey) {
		if plain, err := crypto.DecryptField(apiKey); err == nil {
			apiKey = plain
		}
	}
	client := llm.NewClient(s.LlmEndpoint, apiKey, s.LlmModel, 128)
	ctx, cancel := context.WithTimeout(c.Request.Context(), 30*time.Second)
	defer cancel()
	reply, err := client.Chat(ctx, "你是连通性检查助手，只回复：连接成功。", "ping")
	if err != nil {
		c.JSON(http.StatusOK, gin.H{"success": false, "message": "测试失败: " + err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "message": reply})
}

// CreatePipeline POST /api/pipelines
func CreatePipeline(c *gin.Context) {
	var input struct {
		Name         string `json:"name" binding:"required"`
		Description  string `json:"description"`
		Type         string `json:"type"`
		SourceRepo   string `json:"sourceRepo"`
		SourceBranch string `json:"sourceBranch"`
		DeployType   string `json:"deployType"`
		Env          string `json:"env"`
	}
	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "name 不能为空"})
		return
	}
	setDefault(&input.Type, "native")
	setDefault(&input.SourceBranch, "main")
	setDefault(&input.DeployType, "host")
	setDefault(&input.Env, "staging")

	p := model.Pipeline{
		Name: input.Name, Description: input.Description, Type: input.Type,
		SourceRepo: input.SourceRepo, SourceBranch: input.SourceBranch,
		DeployType: input.DeployType, Env: input.Env,
	}
	if err := database.DB.Create(&p).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, p)
}

// UpdatePipeline PUT /api/pipelines/:id
func UpdatePipeline(c *gin.Context) {
	var p model.Pipeline
	if err := database.DB.First(&p, c.Param("id")).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "pipeline not found"})
		return
	}
	var input map[string]any
	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	allowed := map[string]bool{
		"name": true, "description": true, "sourceRepo": true, "sourceBranch": true,
		"gitopsRepo": true, "gitopsPath": true, "deployType": true, "env": true,
		"triggerMode": true, "cronExpr": true, "webhookToken": true, "watchBranches": true,
		"variables": true, "cachePaths": true, "notifyWebhookURL": true, "jenkinsJobName": true,
	}
	updates := map[string]any{}
	for k, v := range input {
		if allowed[k] {
			updates[k] = v
		}
	}
	if len(updates) > 0 {
		updates["updated_at"] = time.Now()
		database.DB.Model(&p).Updates(updates)
	}
	c.JSON(http.StatusOK, p)
}

// DeletePipeline DELETE /api/pipelines/:id —— 级联删除节点与连线
func DeletePipeline(c *gin.Context) {
	id := c.Param("id")
	database.DB.Where("pipeline_id = ?", id).Delete(&model.PipelineEdge{})
	database.DB.Where("pipeline_id = ?", id).Delete(&model.PipelineNode{})
	database.DB.Delete(&model.Pipeline{}, id)
	c.JSON(http.StatusOK, gin.H{"success": true})
}

// SaveNodes PUT /api/pipelines/:id/nodes —— 全量覆盖保存
func SaveNodes(c *gin.Context) {
	pipelineID := c.Param("id")
	var p model.Pipeline
	if err := database.DB.First(&p, pipelineID).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "pipeline not found"})
		return
	}
	var body struct {
		Nodes []model.PipelineNode `json:"nodes"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	database.DB.Where("pipeline_id = ?", p.ID).Delete(&model.PipelineNode{})
	for i := range body.Nodes {
		body.Nodes[i].ID = 0
		body.Nodes[i].PipelineID = p.ID
		database.DB.Create(&body.Nodes[i])
	}
	database.DB.Model(&p).Update("updated_at", time.Now())
	c.JSON(http.StatusOK, gin.H{"success": true})
}

// SaveEdges PUT /api/pipelines/:id/edges —— 全量覆盖保存
func SaveEdges(c *gin.Context) {
	pipelineID := c.Param("id")
	var p model.Pipeline
	if err := database.DB.First(&p, pipelineID).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "pipeline not found"})
		return
	}
	var body struct {
		Edges []model.PipelineEdge `json:"edges"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	database.DB.Where("pipeline_id = ?", p.ID).Delete(&model.PipelineEdge{})
	for i := range body.Edges {
		body.Edges[i].ID = 0
		body.Edges[i].PipelineID = p.ID
		database.DB.Create(&body.Edges[i])
	}
	database.DB.Model(&p).Update("updated_at", time.Now())
	c.JSON(http.StatusOK, gin.H{"success": true})
}

func setDefault(v *string, def string) {
	if *v == "" {
		*v = def
	}
}