package handlers_packages

import (
	"brunel/packages"
	"log/slog"
	"sort"
	"strings"
	"sync"
	"time"

	"github.com/gofiber/fiber/v2"
)

type FreezeItem struct {
	Name string `json:"name"`
	Ver  string `json:"version"`
	Arch string `json:"architecture"`
}

type FreezesResponse struct {
	Total   int          `json:"total"`
	Freezes []FreezeItem `json:"freezes"`
}

var (
	cachedFreezes    []FreezeItem
	lastCacheTime    time.Time
	cacheDuration    = 1 * time.Hour
	freezeCacheMutex sync.RWMutex
)

func UpdateFreezeCache() error {
	freeze64, freeze32, err := packages.GetFreezeItems()
	if err != nil {
		return err
	}

	combinedFreezes := make([]FreezeItem, 0, len(freeze64)+len(freeze32))

	for _, item := range freeze64 {
		combinedFreezes = append(combinedFreezes, FreezeItem{
			Name: item.Name,
			Ver:  item.Ver,
			Arch: "amd64",
		})
	}

	for _, item := range freeze32 {
		combinedFreezes = append(combinedFreezes, FreezeItem{
			Name: item.Name,
			Ver:  item.Ver,
			Arch: "i386",
		})
	}

	sort.Slice(combinedFreezes, func(i, j int) bool {
		return combinedFreezes[i].Name < combinedFreezes[j].Name
	})

	freezeCacheMutex.Lock()
	defer freezeCacheMutex.Unlock()

	cachedFreezes = combinedFreezes
	lastCacheTime = time.Now()

	return nil
}

func getFreezes() ([]FreezeItem, error) {
	freezeCacheMutex.RLock()
	if time.Since(lastCacheTime) < cacheDuration && len(cachedFreezes) > 0 {
		defer freezeCacheMutex.RUnlock()
		return cachedFreezes, nil
	}
	freezeCacheMutex.RUnlock()

	if err := UpdateFreezeCache(); err != nil {
		return nil, err
	}

	freezeCacheMutex.RLock()
	defer freezeCacheMutex.RUnlock()
	return cachedFreezes, nil
}

func RemoveFromFreezeCache(name, version string) {
	freezeCacheMutex.Lock()
	defer freezeCacheMutex.Unlock()

	for i, item := range cachedFreezes {
		if item.Name == name && item.Ver == version {
			cachedFreezes = append(cachedFreezes[:i], cachedFreezes[i+1:]...)
			break
		}
	}
}

func Freezes(c *fiber.Ctx) error {
	pageNum := c.QueryInt("page", 1)
	pageSize := c.QueryInt("pageSize", 250)
	search := strings.ToLower(c.Query("search"))
	filter := c.Query("filter")

	// Adjust pageNum to be 0-based for slice indexing
	adjustedPageNum := pageNum - 1
	if adjustedPageNum < 0 {
		adjustedPageNum = 0
	}

	freezes, err := getFreezes()
	if err != nil {
		slog.Error("Failed to retrieve freeze items", "error", err)
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
			"error": "Failed to retrieve freeze items",
		})
	}

	filteredFreezes := make([]FreezeItem, 0)
	for _, freeze := range freezes {
		matchesFilter := filter == "" || filter == "All" || strings.EqualFold(freeze.Arch, filter)
		matchesSearch := search == "" || strings.Contains(strings.ToLower(freeze.Name), search)

		if matchesFilter && matchesSearch {
			filteredFreezes = append(filteredFreezes, freeze)
		}
	}

	total := len(filteredFreezes)

	startIndex := adjustedPageNum * pageSize
	endIndex := (adjustedPageNum + 1) * pageSize
	if startIndex >= total {
		filteredFreezes = []FreezeItem{}
	} else {
		if endIndex > total {
			endIndex = total
		}
		filteredFreezes = filteredFreezes[startIndex:endIndex]
	}

	response := FreezesResponse{
		Total:   total,
		Freezes: filteredFreezes,
	}

	return c.Status(fiber.StatusOK).JSON(response)
}