package musichandler

import (
	"strconv"

	"github.com/gin-gonic/gin"

	musiclogic "spark-server/internal/module/music/logic"
	"spark-server/internal/pkg/errs"
	"spark-server/internal/transport/http/respond"
)

type Handler struct {
	svc *musiclogic.Service
}

func New(svc *musiclogic.Service) *Handler {
	return &Handler{svc: svc}
}

// Playlist GET /v1/music/playlist — public curated list + category tree.
// Query categoryId>0 filters tracks belonging to that category or its descendants.
// Query requireMember=true|false filters member-only / free tracks.
func (h *Handler) Playlist(c *gin.Context) {
	if h == nil || h.svc == nil || !h.svc.Ready() {
		respond.JSONError(c, errs.ErrAvailable)
		return
	}
	q, err := parsePlaylistQuery(c)
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	out, err := h.svc.Playlist(c.Request.Context(), q)
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, out)
}

// PlaylistGrouped GET /v1/music/playlist/grouped — leaf categories with nested items.
func (h *Handler) PlaylistGrouped(c *gin.Context) {
	if h == nil || h.svc == nil || !h.svc.Ready() {
		respond.JSONError(c, errs.ErrAvailable)
		return
	}
	var parentID int64
	if raw := c.Query("parentId"); raw != "" {
		n, err := strconv.ParseInt(raw, 10, 64)
		if err != nil || n < 0 {
			respond.JSONError(c, errs.ErrInvalidArgument.WithMsg("parentId 无效"))
			return
		}
		parentID = n
	}
	out, err := h.svc.PlaylistGrouped(c.Request.Context(), parentID)
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, out)
}

// GetTrack GET /v1/music/tracks/:id — single enabled track (public).
func (h *Handler) GetTrack(c *gin.Context) {
	if h == nil || h.svc == nil || !h.svc.Ready() {
		respond.JSONError(c, errs.ErrAvailable)
		return
	}
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil || id <= 0 {
		respond.JSONError(c, errs.ErrInvalidArgument.WithMsg("id 无效"))
		return
	}
	out, err := h.svc.GetPublic(c.Request.Context(), id)
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, out)
}

// Categories GET /v1/music/categories — enabled category tree.
func (h *Handler) Categories(c *gin.Context) {
	if h == nil || h.svc == nil || !h.svc.Ready() {
		respond.JSONError(c, errs.ErrAvailable)
		return
	}
	out, err := h.svc.CategoryTree(c.Request.Context(), true)
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, gin.H{"categories": out})
}

// Settings GET /v1/music/settings — global member preview seconds only.
func (h *Handler) Settings(c *gin.Context) {
	if h == nil || h.svc == nil || !h.svc.Ready() {
		respond.JSONError(c, errs.ErrAvailable)
		return
	}
	out, err := h.svc.Settings(c.Request.Context())
	if err != nil {
		respond.JSONError(c, err)
		return
	}
	respond.JSON(c, out)
}

func parsePlaylistQuery(c *gin.Context) (musiclogic.PlaylistQuery, error) {
	var q musiclogic.PlaylistQuery
	if raw := c.Query("categoryId"); raw != "" {
		n, err := strconv.ParseInt(raw, 10, 64)
		if err != nil || n < 0 {
			return q, errs.ErrInvalidArgument.WithMsg("categoryId 无效")
		}
		q.CategoryID = n
	}
	if raw := c.Query("requireMember"); raw != "" {
		switch raw {
		case "true", "1":
			v := true
			q.RequireMember = &v
		case "false", "0":
			v := false
			q.RequireMember = &v
		default:
			return q, errs.ErrInvalidArgument.WithMsg("requireMember 须为 true|false")
		}
	}
	return q, nil
}