package handler

import (
	"fmt"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"gitm/internal/database"
	"gitm/internal/gitea"
	"gitm/internal/models"
	"gitm/internal/sync"
)

func HandleListServers(c *gin.Context) {
	servers, err := database.GetServers()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, servers)
}

func HandleCreateServer(c *gin.Context) {
	var req struct {
		Name         string `json:"name" binding:"required"`
		URL          string `json:"url" binding:"required"`
		Token        string `json:"token" binding:"required"`
		SyncInterval int    `json:"sync_interval"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	server := &models.GiteaServer{
		Name:         req.Name,
		URL:          req.URL,
		Token:        req.Token,
		SyncInterval: req.SyncInterval,
		Status:       "active",
	}
	if err := database.CreateServer(server); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusCreated, server)
}

func HandleUpdateServer(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid server ID"})
		return
	}
	server, err := database.GetServer(id)
	if err != nil || server == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Server not found"})
		return
	}
	var req struct {
		Name         *string `json:"name"`
		URL          *string `json:"url"`
		Token        *string `json:"token"`
		SyncInterval *int    `json:"sync_interval"`
		Status       *string `json:"status"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if req.Name != nil {
		server.Name = *req.Name
	}
	if req.URL != nil {
		server.URL = *req.URL
	}
	if req.Token != nil {
		server.Token = *req.Token
	}
	if req.SyncInterval != nil {
		server.SyncInterval = *req.SyncInterval
	}
	if req.Status != nil {
		server.Status = *req.Status
	}
	if err := database.UpdateServer(server); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, server)
}

func HandleDeleteServer(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid server ID"})
		return
	}
	if err := database.DeleteServer(id); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "Server deleted"})
}

func HandleTestConnection(c *gin.Context) {
	var req struct {
		URL   string `json:"url" binding:"required"`
		Token string `json:"token" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	client, err := gitea.NewClient(req.URL, req.Token)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	user, err := client.ValidateToken()
	if err != nil {
		c.JSON(http.StatusUnauthorized, gin.H{"error": "Authentication failed"})
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "Connection successful", "user": user.Login})
}

func HandleListRepos(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid server ID"})
		return
	}
	repos, err := database.GetReposByServer(id)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, repos)
}

func HandleDiscoverRepos(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid server ID"})
		return
	}
	server, err := database.GetServer(id)
	if err != nil || server == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Server not found"})
		return
	}
	client, err := gitea.NewClient(server.URL, server.Token)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	giteaRepos, err := client.GetAllRepos()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	reposDir, _ := database.GetSetting("repos_dir")
	if reposDir == "" {
		reposDir = "./data/repos"
	}
	serverDir := reposDir + "/" + strconv.FormatInt(id, 10) + "_" + server.Name
	discovered := 0
	for _, gr := range giteaRepos {
		existing, _ := database.GetRepoByFullName(id, gr.FullName)
		if existing == nil {
			repo := &models.Repo{
				ServerID:   id,
				Name:       gr.Name,
				FullName:   gr.FullName,
				CloneURL:   gr.CloneURL,
				LocalPath:  serverDir + "/" + gr.FullName + ".git",
				SyncStatus: "pending",
			}
			database.CreateRepo(repo)
			discovered++
		}
	}
	c.JSON(http.StatusOK, gin.H{
		"message":     fmt.Sprintf("Discovered %d new repositories", discovered),
		"total_repos": len(giteaRepos),
		"new_repos":   discovered,
	})
}

func HandleSyncServer(engine *sync.Engine) gin.HandlerFunc {
	return func(c *gin.Context) {
		id, err := strconv.ParseInt(c.Param("id"), 10, 64)
		if err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid server ID"})
			return
		}
		if engine.IsSyncing(id) {
			c.JSON(http.StatusConflict, gin.H{"error": "Sync already in progress"})
			return
		}
		go engine.SyncServer(id)
		c.JSON(http.StatusAccepted, gin.H{"message": "Sync started", "server_id": id})
	}
}

func HandleSyncAll(engine *sync.Engine) gin.HandlerFunc {
	return func(c *gin.Context) {
		servers, err := database.GetServers()
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}
		started := 0
		for _, server := range servers {
			if server.Status == "active" && !engine.IsSyncing(server.ID) {
				go engine.SyncServer(server.ID)
				started++
			}
		}
		c.JSON(http.StatusAccepted, gin.H{"message": fmt.Sprintf("Started sync for %d servers", started)})
	}
}

func HandleGetSyncStatus(engine *sync.Engine) gin.HandlerFunc {
	return func(c *gin.Context) {
		id, err := strconv.ParseInt(c.Param("id"), 10, 64)
		if err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid server ID"})
			return
		}
		status := "idle"
		if engine.IsSyncing(id) {
			status = "syncing"
		}
		c.JSON(http.StatusOK, gin.H{"server_id": id, "status": status})
	}
}