package adminhandler

import (
	"errors"
	"io"
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"

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

// MusicHandler serves popadmin music CRUD (Java-style ApiResponse).
type MusicHandler struct {
	svc *musiclogic.Service
}

func NewMusic(svc *musiclogic.Service) *MusicHandler {
	return &MusicHandler{svc: svc}
}

func (h *MusicHandler) ready(c *gin.Context) bool {
	if h == nil || h.svc == nil || !h.svc.Ready() {
		Fail(c, http.StatusServiceUnavailable, "music 服务未就绪")
		return false
	}
	return true
}

func (h *MusicHandler) List(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	list, err := h.svc.ListAdmin(c.Request.Context())
	if err != nil {
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	settings, err := h.svc.Settings(c.Request.Context())
	if err != nil {
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	OK(c, gin.H{"items": list, "settings": settings})
}

func (h *MusicHandler) GetSettings(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	out, err := h.svc.Settings(c.Request.Context())
	if err != nil {
		Fail(c, http.StatusInternalServerError, err.Error())
		return
	}
	OK(c, out)
}

func (h *MusicHandler) PutSettings(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	var body struct {
		MemberPreviewSeconds int `json:"memberPreviewSeconds"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		Fail(c, http.StatusBadRequest, "无效 JSON")
		return
	}
	out, err := h.svc.UpdateSettings(c.Request.Context(), body.MemberPreviewSeconds)
	if err != nil {
		failMusic(c, err)
		return
	}
	OK(c, out)
}

func (h *MusicHandler) Create(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	var in musiclogic.UpsertInput
	if err := c.ShouldBindJSON(&in); err != nil {
		Fail(c, http.StatusBadRequest, "无效 JSON")
		return
	}
	out, err := h.svc.Create(c.Request.Context(), in)
	if err != nil {
		failMusic(c, err)
		return
	}
	OK(c, out)
}

func (h *MusicHandler) Update(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil || id <= 0 {
		Fail(c, http.StatusBadRequest, "无效 id")
		return
	}
	var in musiclogic.UpsertInput
	if err := c.ShouldBindJSON(&in); err != nil {
		Fail(c, http.StatusBadRequest, "无效 JSON")
		return
	}
	out, err := h.svc.Update(c.Request.Context(), id, in)
	if err != nil {
		failMusic(c, err)
		return
	}
	OK(c, out)
}

func (h *MusicHandler) Delete(c *gin.Context) {
	if !h.ready(c) {
		return
	}
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil || id <= 0 {
		Fail(c, http.StatusBadRequest, "无效 id")
		return
	}
	if err := h.svc.Delete(c.Request.Context(), id); err != nil {
		failMusic(c, err)
		return
	}
	OK(c, nil)
}

func (h *MusicHandler) UploadCover(c *gin.Context) {
	h.upload(c, true)
}

func (h *MusicHandler) UploadAudio(c *gin.Context) {
	h.upload(c, false)
}

func (h *MusicHandler) upload(c *gin.Context, cover bool) {
	if !h.ready(c) {
		return
	}
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil || id <= 0 {
		Fail(c, http.StatusBadRequest, "无效 id")
		return
	}
	file, hdr, err := c.Request.FormFile("file")
	if err != nil {
		Fail(c, http.StatusBadRequest, "请用 multipart 字段 file 上传")
		return
	}
	defer file.Close()
	body, err := io.ReadAll(io.LimitReader(file, 51<<20))
	if err != nil {
		Fail(c, http.StatusBadRequest, "读取文件失败")
		return
	}
	ct := hdr.Header.Get("Content-Type")
	var out any
	if cover {
		out, err = h.svc.UploadCover(c.Request.Context(), id, hdr.Filename, body, ct)
	} else {
		out, err = h.svc.UploadAudio(c.Request.Context(), id, hdr.Filename, body, ct)
	}
	if err != nil {
		failMusic(c, err)
		return
	}
	OK(c, out)
}

func failMusic(c *gin.Context, err error) {
	if err == nil {
		return
	}
	if errors.Is(err, musiclogic.ErrNotReady) {
		Fail(c, http.StatusServiceUnavailable, err.Error())
		return
	}
	if app, ok := errs.AsAppError(err); ok {
		switch app.Code {
		case errs.ErrNotFound.Code:
			Fail(c, http.StatusNotFound, app.Msg)
		case errs.ErrInvalidArgument.Code:
			Fail(c, http.StatusBadRequest, app.Msg)
		case errs.ErrAvailable.Code:
			Fail(c, http.StatusServiceUnavailable, app.Msg)
		default:
			Fail(c, http.StatusBadRequest, app.Msg)
		}
		return
	}
	Fail(c, http.StatusInternalServerError, err.Error())
}