package server

import (
	"net/http"
	"time"

	_ "music-server/cmd/docs" // registers the OpenAPI spec
	"music-server/cmd/web"
	"music-server/internal/logging"
	"music-server/internal/server/middleware"

	"github.com/a-h/templ"
	"github.com/labstack/echo/v5"
	echoMiddleware "github.com/labstack/echo/v5/middleware"
	echoSwagger "github.com/swaggo/echo-swagger/v2"
	"github.com/swaggo/swag"
	"go.uber.org/zap"
)

//	@title			MusicServer API
//	@version		1.0
//	@description	API for the MusicServer application
//	@termsOfService	http://sanplex.xyz/terms/

//	@contact.name	Sebastian Olsson
//	@contact.email	zarnor91@gmail.com

//	@license.name	MIT
//	@license.url	http://opensource.org/licenses/MIT

// @BasePath	/

// handlers holds all HTTP handlers.
type handlers struct {
	health     *HealthHandler
	version    *VersionHandler
	character  *CharacterHandler
	download   *DownloadHandler
	sync       *SyncHandler
	music      *MusicHandler
	library    *LibraryHandler
	statistics *StatisticsHandler
	token      *TokenHandler
}

func (s *Server) handlers() handlers {
	return handlers{
		health:     NewHealthHandler(s.db),
		version:    NewVersionHandler(),
		character:  NewCharacterHandler(s.characters),
		download:   NewDownloadHandler(s.releases),
		sync:       NewSyncHandler(s.sync),
		music:      NewMusicHandler(s.music),
		library:    NewLibraryHandler(s.library),
		statistics: NewStatisticsHandler(s.stats),
		token:      NewTokenHandler(s.q, s.cfg.APIPassword, s.cfg.DisableSessionAuth),
	}
}

func (s *Server) RegisterRoutes() http.Handler {
	e := echo.New()
	e.HTTPErrorHandler = httpErrorHandler
	if len(s.cfg.TrustedProxies) > 0 {
		var trust []echo.TrustOption
		for _, ipNet := range s.cfg.TrustedProxies {
			trust = append(trust, echo.TrustIPRange(ipNet))
		}
		e.IPExtractor = echo.ExtractIPFromXFFHeader(trust...)
	}

	e.Use(logging.RequestLogger())
	e.Use(echoMiddleware.Recover())
	e.Use(echoMiddleware.CORSWithConfig(echoMiddleware.CORSConfig{
		AllowOrigins:     []string{"https://*", "http://*"},
		AllowMethods:     []string{"GET", "POST", "PUT", "DELETE", "OPTIONS", "PATCH"},
		AllowHeaders:     []string{"Accept", "Authorization", "Content-Type", "X-CSRF-Token"},
		AllowCredentials: true,
		MaxAge:           300,
	}))

	e.GET("/openapi", serveOpenAPI)
	e.GET("/swagger/*", echoSwagger.WrapHandler)

	e.GET("/assets/*", echo.WrapHandler(http.FileServer(http.FS(web.Assets))))
	e.GET("/search", echo.WrapHandler(templ.Handler(web.SearchForm())))
	e.POST("/find", echo.WrapHandler(web.NewSearchHandler(s.search)))
	e.Static("/", s.cfg.FrontendPath)

	h := s.handlers()
	syncLock := middleware.SyncCheck(s.sync.IsSyncing)

	// Legacy endpoints (deprecated - use /api/v1/ instead)
	legacy := e.Group("", middleware.DeprecationMiddleware)
	registerCommon(legacy, h, syncLock)
	legacy.GET("/health", h.health.HealthCheck)
	legacy.GET("/characters", h.character.GetCharacterList)

	// API v1
	apiV1 := e.Group("/api/v1")
	tokenGroup := apiV1.Group("/token")
	tokenGroup.POST("", h.token.CreateTokenHandler, middleware.RateLimit(10, time.Minute))
	tokenGroup.DELETE("", h.token.DeleteTokenHandler)

	protected := apiV1.Group("", middleware.TokenAuth(s.q, s.cfg.DisableSessionAuth))
	protected.POST("/token/cleanup", h.token.CleanupExpiredSessionsHandler)
	registerCommon(protected, h, syncLock)
	protected.GET("/character/list", h.character.GetCharacterList)

	protected.GET("/soundtracks", h.library.GetSoundtracks)
	protected.GET("/soundtracks/:uuid", h.library.GetSoundtrack)
	protected.GET("/songs/:uuid", h.library.GetSong)
	protected.GET("/songs/:uuid/file", h.library.GetSongFile, syncLock)

	stats := protected.Group("/statistics")
	stats.GET("/soundtracks/most-played", h.statistics.GetMostPlayedSoundtracks)
	stats.GET("/soundtracks/least-played", h.statistics.GetLeastPlayedSoundtracks)
	stats.GET("/soundtracks/never-played", h.statistics.GetNeverPlayedSoundtracks)
	stats.GET("/soundtracks/last-played", h.statistics.GetLastPlayedSoundtracks)
	stats.GET("/soundtracks/oldest-played", h.statistics.GetOldestPlayedSoundtracks)
	stats.GET("/songs/most-played", h.statistics.GetMostPlayedSongs)
	stats.GET("/songs/least-played", h.statistics.GetLeastPlayedSongs)
	stats.GET("/summary", h.statistics.GetStatisticsSummary)

	for _, r := range e.Router().Routes() {
		logging.GetLogger().Debug("Registered route", zap.String("method", r.Method), zap.String("path", r.Path))
	}
	return e
}

// registerCommon registers the routes shared by the legacy and the v1 API.
// syncLock is applied to routes that must not run during a sync.
func registerCommon(g *echo.Group, h handlers, syncLock echo.MiddlewareFunc) {
	g.GET("/version", h.version.GetLatestVersion)
	g.GET("/version/history", h.version.GetVersionHistory)

	g.GET("/character", h.character.GetCharacter)

	g.GET("/download", h.download.CheckLatest)
	g.GET("/download/list", h.download.ListAssetsOfLatest)
	g.GET("/download/windows", h.download.DownloadLatestWindows)
	g.GET("/download/linux", h.download.DownloadLatestLinux)

	g.GET("/sync/progress", h.sync.SyncProgress)
	for _, path := range []string{"/sync", "/sync/new", "/sync/quick"} {
		g.POST(path, h.sync.SyncSoundtracksNewOnlyChanges, syncLock)
	}
	for _, path := range []string{"/sync/full", "/sync/new/full"} {
		g.POST(path, h.sync.SyncSoundtracksNewFull, syncLock)
	}
	g.POST("/sync/reset", h.sync.ResetDB, syncLock)

	music := g.Group("/music", syncLock)
	music.GET("", h.music.GetSong)
	music.GET("/soundTest", h.music.GetSoundCheckSong)
	music.GET("/reset", h.music.ResetMusic)
	music.GET("/rand", h.music.GetRandomSong)
	music.GET("/rand/low", h.music.GetRandomSongLowChance)
	music.GET("/rand/classic", h.music.GetRandomSongClassic)
	music.GET("/next", h.music.GetNextSong)
	music.GET("/previous", h.music.GetPreviousSong)
	music.GET("/all", h.music.GetAllSoundtracksRandom)
	music.GET("/all/order", h.music.GetAllSoundtracks)
	music.GET("/all/random", h.music.GetAllSoundtracksRandom)
	music.PUT("/played", h.music.PutPlayed)
	music.GET("/addQue", h.music.AddLatestToQue)
	music.GET("/addPlayed", h.music.AddLatestPlayed)
	// Info and list are read-only and stay available during a sync.
	g.GET("/music/info", h.music.GetSongInfo)
	g.GET("/music/list", h.music.GetPlayedSongs)
}

// serveOpenAPI serves the embedded OpenAPI spec.
func serveOpenAPI(c *echo.Context) error {
	doc, err := swag.ReadDoc()
	if err != nil {
		return err
	}
	return c.Blob(http.StatusOK, echo.MIMEApplicationJSON, []byte(doc))
}