package api

import (
	"bytes"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"time"

	"clickploy/internal/auth"
	"clickploy/internal/db"
	"clickploy/internal/models"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

func (h *Handler) RegisterProjectRoutes(r *gin.Engine) {
	protected := r.Group("/api", AuthMiddleware())
	{
		protected.POST("/projects", h.createProject)
		protected.GET("/projects", h.listProjects)
		protected.GET("/projects/:id", h.getProject)
		protected.PUT("/projects/:id/env", h.updateProjectEnv)
		protected.POST("/projects/:id/redeploy", h.redeployProject)
		protected.GET("/activity", h.getActivity)
	}
}

func (h *Handler) updateProjectEnv(c *gin.Context) {
	userID, _ := c.Get("userID")
	projectID := c.Param("id")

	var req struct {
		EnvVars map[string]string `json:"env_vars"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	pid, err := strconv.ParseUint(projectID, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid Project ID"})
		return
	}

	var project models.Project
	if result := db.DB.Where("id = ? AND owner_id = ?", pid, userID).First(&project); result.Error != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Project not found"})
		return
	}

	tx := db.DB.Begin()
	if err := tx.Where("project_id = ?", project.ID).Delete(&models.EnvVar{}).Error; err != nil {
		tx.Rollback()
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update env vars"})
		return
	}

	for k, v := range req.EnvVars {
		envVar := models.EnvVar{
			ProjectID: project.ID,
			Key:       k,
			Value:     v,
		}
		if err := tx.Create(&envVar).Error; err != nil {
			tx.Rollback()
			c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to save env var"})
			return
		}
	}

	tx.Commit()
	c.JSON(http.StatusOK, gin.H{"status": "updated"})
}

func (h *Handler) redeployProject(c *gin.Context) {
	userID, _ := c.Get("userID")
	projectID := c.Param("id")

	pid, err := strconv.ParseUint(projectID, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid Project ID"})
		return
	}

	var project models.Project
	if result := db.DB.Preload("EnvVars").Where("id = ? AND owner_id = ?", pid, userID).First(&project); result.Error != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Project not found"})
		return
	}

	deployment := models.Deployment{
		ProjectID: project.ID,
		Status:    "building",
		Commit:    "MANUAL",
		Logs:      "Starting manual redeploy...",
	}
	db.DB.Create(&deployment)

	go func() {
		var logBuffer bytes.Buffer
		streamer := &StreamWriter{DeploymentID: deployment.ID}
		multi := io.MultiWriter(&logBuffer, streamer)

		envMap := make(map[string]string)
		for _, env := range project.EnvVars {
			envMap[env.Key] = env.Value
		}

		imageName, err := h.builder.Build(project.RepoURL, project.Name, project.GitToken, project.BuildCommand, project.StartCommand, project.InstallCommand, project.Runtime, envMap, multi)
		deployment.Logs = logBuffer.String()

		if err != nil {
			deployment.Status = "failed"
			deployment.Logs += fmt.Sprintf("\n\nBuild Error: %v", err)
			db.DB.Save(&deployment)
			return
		}

		var envStrings []string
		for _, env := range project.EnvVars {
			envStrings = append(envStrings, fmt.Sprintf("%s=%s", env.Key, env.Value))
		}

		containerID, err := h.deployer.RunContainer(c.Request.Context(), imageName, project.Name, project.Port, envStrings)
		if err != nil {
			deployment.Status = "failed"
			deployment.Logs += fmt.Sprintf("\n\nContainer Error: %v", err)
			db.DB.Save(&deployment)
			return
		}

		deployment.Status = "live"
		deployment.URL = fmt.Sprintf("http://localhost:%d", project.Port)
		deployment.Logs += fmt.Sprintf("\n\nContainer ID: %s", containerID)
		db.DB.Save(&deployment)
	}()

	c.JSON(http.StatusOK, gin.H{"status": "redeployment_started", "deployment_id": deployment.ID})
}

func (h *Handler) getActivity(c *gin.Context) {
	userID, _ := c.Get("userID")
	var deployments []models.Deployment

	err := db.DB.Joins("JOIN projects ON projects.id = deployments.project_id").
		Where("projects.owner_id = ?", userID).
		Order("deployments.created_at desc").
		Limit(20).
		Preload("Project").
		Find(&deployments).Error

	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to fetch activity"})
		return
	}
	c.JSON(http.StatusOK, deployments)
}

func (h *Handler) createProject(c *gin.Context) {
	userID, _ := c.Get("userID")

	var req struct {
		DeployRequest
		EnvVars        map[string]string `json:"env_vars"`
		BuildCommand   string            `json:"build_command"`
		StartCommand   string            `json:"start_command"`
		InstallCommand string            `json:"install_command"`
		Runtime        string            `json:"runtime"`
	}

	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	port, err := h.ports.GetPort(req.Name, req.Port)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Port allocation failed: %v", err)})
		return
	}

	var envVarsModel []models.EnvVar
	var envStrings []string
	for k, v := range req.EnvVars {
		envStrings = append(envStrings, fmt.Sprintf("%s=%s", k, v))
		envVarsModel = append(envVarsModel, models.EnvVar{Key: k, Value: v})
	}

	webhookSecret, _ := auth.HashPassword(fmt.Sprintf("%s-%d-%d", req.Name, userID, time.Now().UnixNano()))

	project := models.Project{
		Name:           req.Name,
		RepoURL:        req.Repo,
		OwnerID:        userID.(uint),
		Port:           port,
		WebhookSecret:  webhookSecret,
		GitToken:       req.GitToken,
		EnvVars:        envVarsModel,
		BuildCommand:   req.BuildCommand,
		StartCommand:   req.StartCommand,
		InstallCommand: req.InstallCommand,
		Runtime:        req.Runtime,
	}

	if result := db.DB.Create(&project); result.Error != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to save project to DB"})
		return
	}

	deployment := models.Deployment{
		ProjectID: project.ID,
		Status:    "building",
		Commit:    "HEAD",
		Logs:      "Starting build...",
	}
	db.DB.Create(&deployment)

	go func() {
		var logBuffer bytes.Buffer
		streamer := &StreamWriter{DeploymentID: deployment.ID}
		multi := io.MultiWriter(&logBuffer, streamer)

		imageName, err := h.builder.Build(req.Repo, req.Name, req.GitToken, req.BuildCommand, req.StartCommand, req.InstallCommand, req.Runtime, req.EnvVars, multi)
		deployment.Logs = logBuffer.String()

		if err != nil {
			deployment.Status = "failed"
			deployment.Logs += fmt.Sprintf("\n\nBuild Error: %v", err)
			db.DB.Save(&deployment)
			return
		}

		containerID, err := h.deployer.RunContainer(c.Request.Context(), imageName, req.Name, port, envStrings)
		if err != nil {
			deployment.Status = "failed"
			deployment.Logs += fmt.Sprintf("\n\nContainer Error: %v", err)
			db.DB.Save(&deployment)
			return
		}

		deployment.Status = "live"
		deployment.URL = fmt.Sprintf("http://localhost:%d", port)
		deployment.Logs += fmt.Sprintf("\n\nContainer ID: %s", containerID)
		db.DB.Save(&deployment)
	}()

	project.Deployments = []models.Deployment{deployment}
	c.JSON(http.StatusOK, project)
}

func (h *Handler) listProjects(c *gin.Context) {
	userID, _ := c.Get("userID")
	var projects []models.Project
	if result := db.DB.Preload("Deployments").Where("owner_id = ?", userID).Find(&projects); result.Error != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to fetch projects"})
		return
	}
	c.JSON(http.StatusOK, projects)
}

func (h *Handler) getProject(c *gin.Context) {
	userID, _ := c.Get("userID")
	projectID := c.Param("id")

	pid, err := strconv.ParseUint(projectID, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid Project ID"})
		return
	}

	var project models.Project
	if result := db.DB.Order("created_at desc").Preload("Deployments", func(db *gorm.DB) *gorm.DB {
		return db.Order("deployments.created_at desc")
	}).Preload("EnvVars").Where("id = ? AND owner_id = ?", pid, userID).First(&project); result.Error != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Project not found"})
		return
	}
	c.JSON(http.StatusOK, project)
}