package web

import (
	"context"
	"net/http"
	"time"

	"git.noroutes.net/NoRoutes/vibetunes/internal/auth"
	"git.noroutes.net/NoRoutes/vibetunes/internal/database"
)

func (h *Web) handleAdminRoot(w http.ResponseWriter, r *http.Request) {
	http.Redirect(w, r, "/admin/users", http.StatusFound)
}

// --- Users ---

func (h *Web) handleAdminUsers(w http.ResponseWriter, r *http.Request) {
	users, err := database.ListUsers(h.DB)
	if err != nil {
		http.Error(w, "internal error", http.StatusInternalServerError)
		return
	}
	h.page(w, r, "admin_users", "admin_users", "Users", users)
}

func (h *Web) handleAdminUserCreate(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseForm(); err != nil {
		http.Error(w, "bad request", http.StatusBadRequest)
		return
	}
	username := r.FormValue("username")
	password := r.FormValue("password")
	isAdmin := r.FormValue("is_admin") == "1"
	if username == "" || len(password) < 8 {
		http.Redirect(w, r, "/admin/users", http.StatusFound)
		return
	}
	hash, err := auth.HashPassword(password)
	if err != nil {
		http.Error(w, "internal error", http.StatusInternalServerError)
		return
	}
	if _, err := database.CreateUser(h.DB, username, "", hash, isAdmin); err != nil {
		http.Error(w, "internal error", http.StatusInternalServerError)
		return
	}
	http.Redirect(w, r, "/admin/users", http.StatusFound)
}

func (h *Web) handleAdminUserToggleDisabled(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	target, err := database.GetUserByID(h.DB, id)
	if err != nil {
		http.NotFound(w, r)
		return
	}
	if err := database.SetUserDisabled(h.DB, id, !target.Disabled); err != nil {
		http.Error(w, "internal error", http.StatusInternalServerError)
		return
	}
	if !target.Disabled { // just disabled it: revoke sessions
		_ = database.DeleteUserSessions(h.DB, id)
	}
	http.Redirect(w, r, "/admin/users", http.StatusFound)
}

func (h *Web) handleAdminUserDelete(w http.ResponseWriter, r *http.Request) {
	current := auth.UserFromContext(r.Context())
	id := r.PathValue("id")
	if id == current.ID {
		http.Error(w, "cannot delete your own account", http.StatusBadRequest)
		return
	}
	if err := database.DeleteUser(h.DB, id); err != nil {
		http.Error(w, "internal error", http.StatusInternalServerError)
		return
	}
	http.Redirect(w, r, "/admin/users", http.StatusFound)
}

// --- Music folders ---

func (h *Web) handleAdminFolders(w http.ResponseWriter, r *http.Request) {
	folders, err := database.ListMusicFolders(h.DB)
	if err != nil {
		http.Error(w, "internal error", http.StatusInternalServerError)
		return
	}
	h.page(w, r, "admin_folders", "admin_folders", "Music Folders", folders)
}

func (h *Web) handleAdminFolderCreate(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseForm(); err != nil {
		http.Error(w, "bad request", http.StatusBadRequest)
		return
	}
	name := r.FormValue("name")
	path := r.FormValue("path")
	kind := r.FormValue("kind")
	if kind == "" {
		kind = "music"
	}
	if name == "" || path == "" {
		http.Redirect(w, r, "/admin/folders", http.StatusFound)
		return
	}
	folder, err := database.CreateMusicFolder(h.DB, name, path, kind)
	if err != nil {
		http.Error(w, "internal error", http.StatusInternalServerError)
		return
	}
	if h.Scanner != nil {
		go func() { _ = h.Scanner.ScanFolder(context.Background(), folder.ID) }()
	}
	http.Redirect(w, r, "/admin/folders", http.StatusFound)
}

func (h *Web) handleAdminFolderToggle(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	folder, err := database.GetMusicFolder(h.DB, id)
	if err != nil {
		http.NotFound(w, r)
		return
	}
	if err := database.SetMusicFolderEnabled(h.DB, id, !folder.Enabled); err != nil {
		http.Error(w, "internal error", http.StatusInternalServerError)
		return
	}
	http.Redirect(w, r, "/admin/folders", http.StatusFound)
}

func (h *Web) handleAdminFolderDelete(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := database.DeleteMusicFolder(h.DB, id); err != nil {
		http.Error(w, "internal error", http.StatusInternalServerError)
		return
	}
	http.Redirect(w, r, "/admin/folders", http.StatusFound)
}

func (h *Web) handleAdminFolderScan(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if _, err := database.GetMusicFolder(h.DB, id); err != nil {
		http.NotFound(w, r)
		return
	}
	if h.Scanner != nil {
		go func() { _ = h.Scanner.ScanFolder(context.Background(), id) }()
	}
	referer := r.Header.Get("Referer")
	if referer == "" {
		referer = "/admin/scanner"
	}
	http.Redirect(w, r, referer, http.StatusFound)
}

// --- Scanner status ---

type folderScanStatus struct {
	Folder *database.MusicFolder
	State  *database.ScanState
}

func (h *Web) handleAdminScanner(w http.ResponseWriter, r *http.Request) {
	folders, err := database.ListMusicFolders(h.DB)
	if err != nil {
		http.Error(w, "internal error", http.StatusInternalServerError)
		return
	}
	var out []folderScanStatus
	for _, f := range folders {
		state, err := database.GetScanState(h.DB, f.ID)
		if err != nil {
			continue
		}
		out = append(out, folderScanStatus{Folder: f, State: state})
	}
	h.page(w, r, "admin_scanner", "admin_scanner", "Scanner", out)
}

// --- System settings ---

func (h *Web) handleAdminSettings(w http.ResponseWriter, r *http.Request) {
	h.renderAdminSettings(w, r, "", "")
}

func (h *Web) renderAdminSettings(w http.ResponseWriter, r *http.Request, flash, kind string) {
	trusted := ""
	for i, p := range h.Config.ExtAuth.TrustedSources {
		if i > 0 {
			trusted += ", "
		}
		trusted += p.String()
	}
	h.flash(w, r, "admin_settings", "admin_settings", "System Settings", flash, kind, struct {
		ScanInterval          string
		FFmpegPath            string
		FFprobePath           string
		ExtAuthEnabled        bool
		ExtAuthTrustedSources string
		ExtAuthHeader         string
	}{
		ScanInterval:          database.GetSetting(h.DB, "scan_interval", h.Config.ScanInterval.String()),
		FFmpegPath:            database.GetSetting(h.DB, "ffmpeg_path", h.Config.FFmpegPath),
		FFprobePath:           database.GetSetting(h.DB, "ffprobe_path", h.Config.FFprobePath),
		ExtAuthEnabled:        h.Config.ExtAuth.Enabled,
		ExtAuthTrustedSources: trusted,
		ExtAuthHeader:         h.Config.ExtAuth.UserHeader,
	})
}

func (h *Web) handleAdminSettingsUpdate(w http.ResponseWriter, r *http.Request) {
	if err := r.ParseForm(); err != nil {
		http.Error(w, "bad request", http.StatusBadRequest)
		return
	}
	interval := r.FormValue("scan_interval")
	if _, err := time.ParseDuration(interval); err != nil {
		h.renderAdminSettings(w, r, "Invalid scan interval: "+err.Error(), "danger")
		return
	}
	_ = database.SetSetting(h.DB, "scan_interval", interval)
	_ = database.SetSetting(h.DB, "ffmpeg_path", r.FormValue("ffmpeg_path"))
	_ = database.SetSetting(h.DB, "ffprobe_path", r.FormValue("ffprobe_path"))
	h.renderAdminSettings(w, r, "Settings saved. Some changes take effect after a restart.", "success")
}