package handlers

import (
	"encoding/json"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"

	"github.com/gofiber/fiber/v2"
	"github.com/savethenurse/ai-media-hub/backend/models"
	"github.com/savethenurse/ai-media-hub/backend/services"
)

// SearchAndFilter handles Zone A logic
func SearchAndFilter(c *fiber.Ctx) error {
	query := c.Query("q")
	if query == "" {
		return c.Status(400).JSON(fiber.Map{"error": "Query required"})
	}

	// 1. Send search query to CSE
	urls, err := services.PerformSearch(query)
	if err != nil {
		return c.Status(500).JSON(fiber.Map{"error": err.Error()})
	}

	if len(urls) == 0 {
		return c.JSON(fiber.Map{"recommended": []string{}})
	}

	// 2. Filter with Gemini
	result, err := services.FilterImagesWithGemini(query, urls)
	if err != nil {
		return c.Status(500).JSON(fiber.Map{"error": err.Error()})
	}

	return c.JSON(result)
}

// UploadMedia handles Zone B logic
func UploadMedia(c *fiber.Ctx) error {
	file, err := c.FormFile("file")
	if err != nil {
		return c.Status(400).JSON(fiber.Map{"error": "File upload required"})
	}

	downloadsDir := os.Getenv("DOWNLOADS_DIR")
	if downloadsDir == "" {
		downloadsDir = "/app/downloads"
	}

	dest := filepath.Join(downloadsDir, file.Filename)
	if err := c.SaveFile(file, dest); err != nil {
		return c.Status(500).JSON(fiber.Map{"error": err.Error()})
	}

	// Logging to DB
	models.DB.Create(&models.MediaHistory{
		SourceURL: file.Filename, // Just to log it, though not a URL
		FilePath:  dest,
		Status:    "success",
		Type:      "upload",
	})

	return c.JSON(fiber.Map{"status": "success", "filename": file.Filename})
}

// DownloadMedia handles Zone C logic
func DownloadMedia(c *fiber.Ctx) error {
	type Request struct {
		URL   string `json:"url"`
		Start string `json:"start"`
		End   string `json:"end"`
	}

	var req Request
	if err := c.BodyParser(&req); err != nil {
		return c.Status(400).JSON(fiber.Map{"error": "Invalid JSON"})
	}

	// Check duplicates
	var hist models.MediaHistory
	res := models.DB.Where("source_url = ?", req.URL).First(&hist)
	if res.RowsAffected > 0 && c.Query("confirm") != "true" {
		return c.Status(statusConflict).JSON(fiber.Map{"error": "Duplicate", "need_confirm": true})
	}

	downloadsDir := os.Getenv("DOWNLOADS_DIR")
	if downloadsDir == "" {
		downloadsDir = "/app/downloads"
	}

	// Execute Python worker asynchronously or synchronously
	// For simplicity, we'll do it synchronously and broadcast progress via WS if we capture it. 
	// But it's easier to just run the command and wait.
	BroadcastProgress("Downloading: " + req.URL)

	go func() {
		args := []string{"./worker/downloader.py", "--url", req.URL, "--outdir", downloadsDir}
		if req.Start != "" {
			args = append(args, "--start", req.Start)
		}
		if req.End != "" {
			args = append(args, "--end", req.End)
		}

		cmd := exec.Command("python", args...)
		fmt.Printf("[DEBUG Go Exec] Command: %v\n", cmd.String())
		
		output, err := cmd.CombinedOutput()
		fmt.Printf("[DEBUG Go Exec] Output:\n%s\n", string(output))
		
		if err != nil {
			fmt.Printf("[DEBUG Go Exec] Download error: %v\n", string(output))
			BroadcastProgress("Error: " + err.Error())
			models.DB.Create(&models.MediaHistory{
				SourceURL: req.URL,
				Status:    "error",
				Type:      "download",
			})
			return
		}

		var result map[string]interface{}
		json.Unmarshal(output, &result)

		BroadcastProgress(fmt.Sprintf("Download Success: %v", req.URL))
		models.DB.Create(&models.MediaHistory{
			SourceURL: req.URL,
			Status:    "success",
			Type:      "download",
			FilePath:  fmt.Sprintf("%v", result["filepath"]),
		})
	}()

	return c.JSON(fiber.Map{"status": "started", "message": "Download process started"})
}

const statusConflict = 409