package handlers

import (
	"bookhoard/internal/database"
	wsync "bookhoard/internal/sync"
	"bookhoard/internal/utils"
	"context"
	"encoding/json"
	"net/http"
	"strconv"
	"time"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgtype"
	"github.com/labstack/echo/v5"
)

// getDeviceIcon returns an emoji icon for device type
func getDeviceIcon(deviceType string) string {
	switch deviceType {
	case "kobo":
		return "📚"
	case "koreader":
		return "📖"
	case "kindle":
		return "📱"
	default:
		return "📚"
	}
}

// UpdateUniversalProgress updates progress with automatic conversion
// GetProgressHistory retrieves reading session history
func (h *Handler) GetProgressHistory(c *echo.Context) error {
	user := MustGetAuthenticatedUser(c)

	mediaItemID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		return echo.NewHTTPError(http.StatusBadRequest, "invalid media item ID")
	}

	limit := 50
	if l := c.QueryParam("limit"); l != "" {
		if parsed, err := strconv.Atoi(l); err == nil && parsed > 0 && parsed <= 100 {
			limit = parsed
		}
	}

	history, err := h.db.GetReadingHistory(context.Background(), database.GetReadingHistoryParams{
		UserID:      pgtype.UUID{Bytes: user.ID.Bytes, Valid: true},
		MediaItemID: pgtype.UUID{Bytes: mediaItemID, Valid: true},
		Limit:       int32(limit),
	})
	if err != nil {
		return echo.NewHTTPError(http.StatusInternalServerError, "failed to get history")
	}

	return c.JSON(http.StatusOK, map[string]interface{}{
		"media_item_id": mediaItemID,
		"sessions":      history,
		"count":         len(history),
	})
}

type ProgressWithMedia struct {
	MediaItemID        uuid.UUID `json:"media_item_id"`
	Title              string    `json:"title"`
	Author             string    `json:"author"`
	CoverImagePath     string    `json:"cover_image_path"`
	Percentage         float64   `json:"percentage"`
	CurrentPage        int32     `json:"current_page"`
	TotalPages         int32     `json:"total_pages"`
	LastReadAt         time.Time `json:"last_read_at"`
	Epubcfi            string    `json:"epubcfi"`
	LastSyncDevice     string    `json:"last_sync_device"`
	DeviceName         string    `json:"device_name,omitempty"`
	DeviceType         string    `json:"device_type,omitempty"`
	DeviceIcon         string    `json:"device_icon,omitempty"`
	ProgressPercentage float64   `json:"-"`
	EpubCFI            string    `json:"-"`
	LastUpdated        string    `json:"-"`
	FormatGroup        string    `json:"format_group"`
	EstimatedPages     int       `json:"estimated_pages"`
	// Audiobook whole-book duration (seconds) for H:M:S progress display
	DurationSeconds float64 `json:"duration_seconds,omitempty"`
}

// audioDurationFrom pulls duration_seconds from the scan's audio_metadata
// JSONB (0 when the item isn't audio or hasn't been probed).
func audioDurationFrom(raw []byte) float64 {
	if len(raw) == 0 {
		return 0
	}
	var payload struct {
		DurationSeconds float64 `json:"duration_seconds"`
	}
	if json.Unmarshal(raw, &payload) != nil {
		return 0
	}
	return payload.DurationSeconds
}

// GetAllProgressData retrieves all progress for a user with sync source info.
// The registered /progress SSR page renders this (frontend.go); the old
// GetAllProgress HTTP handler (an unregistered near-copy) was deleted.
func (h *Handler) GetAllProgressData(c *echo.Context) ([]ProgressWithMedia, error) {
	user := MustGetAuthenticatedUser(c)

	progressList := []ProgressWithMedia{}

	mediaItems, err := h.db.ListMediaItems(c.Request().Context(), database.ListMediaItemsParams{
		Limit:  1000,
		Offset: 0,
	})
	if err != nil {
		return nil, err
	}

	for _, mediaItem := range mediaItems {
		progress, err := h.db.GetUniversalProgress(c.Request().Context(), database.GetUniversalProgressParams{
			MediaItemID: mediaItem.ID,
			UserID:      user.ID,
		})
		if err != nil {
			continue
		}

		coverPath := utils.ResolveMediaURL(mediaItem.LibraryID, mediaItem.CoverImagePath)

		author := ""
		if mediaItem.Author.Valid {
			author = mediaItem.Author.String
		}

		epubcfi := ""
		if progress.Epubcfi.Valid {
			epubcfi = progress.Epubcfi.String
		}

		deviceName := ""
		if progress.LastSyncDevice.Valid {
			deviceName = progress.LastSyncDevice.String
		}

		lastUpdated := ""
		if progress.LastReadAt.Valid {
			lastUpdated = utils.FormatTimeInTimezone(progress.LastReadAt.Time, user.Timezone.String)
		}

		progressList = append(progressList, ProgressWithMedia{
			MediaItemID:        progress.MediaItemID.Bytes,
			Title:              mediaItem.Title,
			Author:             author,
			CoverImagePath:     coverPath,
			Percentage:         progress.Percentage.Float64,
			CurrentPage:        progress.CurrentPage.Int32,
			TotalPages:         progress.TotalPages.Int32,
			LastReadAt:         progress.LastReadAt.Time,
			Epubcfi:            epubcfi,
			LastSyncDevice:     deviceName,
			ProgressPercentage: progress.Percentage.Float64 * 100,
			EpubCFI:            epubcfi,
			LastUpdated:        lastUpdated,
			DeviceIcon:         getDeviceIcon(deviceName),
			DeviceName:         deviceName,
			DeviceType:         deviceName,
			FormatGroup:        mediaItem.FormatGroup,
			// Audiobook "current position" needs whole-book duration
			// (H:M:S display); parsed from the scanner's audio_metadata.
			DurationSeconds: audioDurationFrom(mediaItem.AudioMetadata),
			EstimatedPages:  wsync.EstimatedPages(mediaItem.TotalCharacters.Int64),
		})
	}

	return progressList, nil
}