package handler

import (
	"fmt"
	"net/http"
	"time"

	"github.com/gin-gonic/gin"

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

func clientFromServer(s model.JenkinsServer) *jenkins.Client {
	token := s.Token
	if crypto.IsEncrypted(token) {
		if plain, err := crypto.DecryptField(token); err == nil {
			token = plain
		}
	}
	return jenkins.NewClient(s.BaseURL, s.Username, token)
}

// ---- Jenkins 服务器 CRUD ----

func ListJenkinsServers(c *gin.Context) {
	var list []model.JenkinsServer
	database.DB.Order("updated_at DESC").Find(&list)
	for i := range list {
		list[i].TokenSet = list[i].Token != ""
		list[i].Token = ""
	}
	c.JSON(http.StatusOK, list)
}

func CreateJenkinsServer(c *gin.Context) {
	var raw map[string]any
	if err := c.ShouldBindJSON(&raw); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	name, _ := raw["name"].(string)
	baseURL, _ := raw["baseUrl"].(string)
	if name == "" || baseURL == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "名称和地址不能为空"})
		return
	}
	s := model.JenkinsServer{Name: name, BaseURL: baseURL, Enabled: true}
	s.Username, _ = raw["username"].(string)
	if token, ok := raw["token"].(string); ok && token != "" {
		enc, err := crypto.EncryptField(token)
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "Token 加密失败"})
			return
		}
		s.Token = enc
	}
	if err := database.DB.Create(&s).Error; err != nil {
		c.JSON(http.StatusConflict, gin.H{"error": "创建失败：名称可能已存在"})
		return
	}
	s.TokenSet = s.Token != ""
	s.Token = ""
	c.JSON(http.StatusOK, s)
}

func UpdateJenkinsServer(c *gin.Context) {
	var s model.JenkinsServer
	if err := database.DB.First(&s, c.Param("id")).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "jenkins server not found"})
		return
	}
	var raw map[string]any
	_ = c.ShouldBindJSON(&raw)
	updates := map[string]any{}
	for _, k := range []string{"name", "baseUrl", "username", "enabled", "remark"} {
		if v, ok := raw[k]; ok {
			key := k
			if k == "baseUrl" {
				key = "base_url"
			}
			updates[key] = v
		}
	}
	if token, ok := raw["token"].(string); ok && token != "" {
		if enc, err := crypto.EncryptField(token); err == nil {
			updates["token"] = enc
		}
	}
	if len(updates) > 0 {
		database.DB.Model(&s).Updates(updates)
	}
	database.DB.First(&s, s.ID)
	s.TokenSet = s.Token != ""
	s.Token = ""
	c.JSON(http.StatusOK, s)
}

func DeleteJenkinsServer(c *gin.Context) {
	database.DB.Delete(&model.JenkinsServer{}, c.Param("id"))
	c.JSON(http.StatusOK, gin.H{"success": true})
}

// TestJenkinsServer POST /api/jenkins-servers/:id/test —— 真实连通测试
func TestJenkinsServer(c *gin.Context) {
	var s model.JenkinsServer
	if err := database.DB.First(&s, c.Param("id")).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "jenkins server not found"})
		return
	}
	start := time.Now()
	err := clientFromServer(s).Test()
	c.JSON(http.StatusOK, gin.H{
		"success": err == nil, "latencyMs": time.Since(start).Milliseconds(),
		"message": func() string {
			if err != nil {
				return "连接失败: " + err.Error()
			}
			return "连接成功，认证通过"
		}(),
	})
}

// ListJenkinsJobs GET /api/jenkins-servers/:id/jobs —— 真实拉取 Job 树（folder 已压平）
func ListJenkinsJobs(c *gin.Context) {
	var s model.JenkinsServer
	if err := database.DB.First(&s, c.Param("id")).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "jenkins server not found"})
		return
	}
	jobs, err := clientFromServer(s).ListJobs()
	if err != nil {
		c.JSON(http.StatusBadGateway, gin.H{"error": "拉取 Job 失败: " + err.Error()})
		return
	}
	c.JSON(http.StatusOK, jobs)
}

// ImportJenkinsJobs POST /api/jenkins-servers/:id/import —— 导入 Job 为 jenkins 类型流水线
func ImportJenkinsJobs(c *gin.Context) {
	var s model.JenkinsServer
	if err := database.DB.First(&s, c.Param("id")).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "jenkins server not found"})
		return
	}
	var body struct {
		Jobs []string `json:"jobs"`
	}
	if err := c.ShouldBindJSON(&body); err != nil || len(body.Jobs) == 0 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "请选择要导入的 Job"})
		return
	}

	imported, skipped := 0, 0
	for _, jobPath := range body.Jobs {
		var exist model.Pipeline
		if err := database.DB.Where("jenkins_job_name = ? AND jenkins_server_id = ?", jobPath, s.ID).First(&exist).Error; err == nil {
			skipped++
			continue
		}
		name := jobPath
		if len(name) > 60 {
			name = name[len(name)-60:]
		}
		p := model.Pipeline{
			Name: name, Description: "从 Jenkins 导入 (" + s.Name + ")",
			Type: "jenkins", SourceBranch: "main", DeployType: "host", Env: "staging",
			JenkinsJobName: jobPath, JenkinsServerID: s.ID,
		}
		// 名称冲突时追加后缀保证唯一
		base := name
		for i := 0; ; i++ {
			var cnt int64
			database.DB.Model(&model.Pipeline{}).Where("name = ?", p.Name).Count(&cnt)
			if cnt == 0 {
				break
			}
			if i >= 5 {
				p.Name = fmt.Sprintf("%s-%d", base, time.Now().UnixMilli())
				break
			}
			p.Name = fmt.Sprintf("%s-%d", base, i+1)
		}
		database.DB.Create(&p)
		imported++
	}
	c.JSON(http.StatusOK, gin.H{"success": true, "imported": imported, "skipped": skipped})
}

// jenkinsRunEngine jenkins 类型流水线的真实执行引擎：
// 触发 → 队列 → 增量控制台 → 结果映射，全程写 LogEntry + SSE 推送
func jenkinsRunEngine(hub *Hub, run model.PipelineRun, client *jenkins.Client, jobName string) {
	start := time.Now()
	emit := func(msg string) {
		entry := model.LogEntry{RunID: run.ID, StageID: 0, Level: "info", Message: msg, Source: "jenkins", Timestamp: time.Now()}
		database.DB.Create(&entry)
		hub.Publish(run.RunID, "log", entry)
	}
	setRun := func(status string) {
		now := time.Now()
		database.DB.Model(&model.PipelineRun{}).Where("id = ?", run.ID).Updates(map[string]any{
			"status": status, "duration_ms": time.Since(start).Milliseconds(), "completed_at": &now,
		})
		hub.Publish(run.RunID, "run", gin.H{"runId": run.RunID, "status": status, "durationMs": time.Since(start).Milliseconds()})
		if status == "success" || status == "failed" {
			NotifyWebhookEvent("pipeline."+status, map[string]any{
				"runId": run.RunID, "pipeline": run.PipelineName, "durationMs": time.Since(start).Milliseconds(),
			})
		}
	}

	emit("$ jenkins build \"" + jobName + "\"")
	queueURL, err := client.Trigger(jobName, nil)
	if err != nil {
		emit("触发失败: " + err.Error())
		setRun("failed")
		return
	}
	emit("已进入 Jenkins 构建队列…")

	buildNumber, buildURL, err := client.WaitQueue(queueURL, 10*time.Minute, emit)
	if err != nil {
		emit("队列等待失败: " + err.Error())
		setRun("failed")
		return
	}
	database.DB.Model(&model.PipelineRun{}).Where("id = ?", run.ID).Updates(map[string]any{
		"build_number": buildNumber, "external_run_id": fmt.Sprintf("#%d", buildNumber), "external_url": buildURL,
	})
	emit(fmt.Sprintf("构建 #%d 已开始: %s", buildNumber, buildURL))

	client.StreamConsole(buildURL, emit)
	result, err := client.WaitResult(buildURL, 30*time.Minute)
	if err != nil {
		emit("获取构建结果超时: " + err.Error())
		setRun("failed")
		return
	}
	emit("Jenkins 结果: " + result)
	setRun(jenkins.MapResult(result))
}