// SiYuan - Refactor your thinking
// Copyright (c) 2020-present, b3log.org
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package cmd

import (
	"encoding/json"
	"fmt"
	"math/rand"
	"os"
	"path/filepath"
	"sync"
	"text/tabwriter"
	"time"

	"github.com/88250/gulu"

	"github.com/siyuan-note/siyuan/kernel/model"
	"github.com/siyuan-note/siyuan/kernel/sql"
	"github.com/siyuan-note/siyuan/kernel/util"

	"github.com/spf13/cobra"
)

var notebookCmd = &cobra.Command{
	Use:   "notebook",
	Short: "Manage notebooks",
}

var notebookListCmd = &cobra.Command{
	Use:   "list",
	Short: "List all notebooks",
	RunE: func(cmd *cobra.Command, args []string) error {
		boxes, err := model.ListNotebooks()
		if err != nil {
			return err
		}
		switch outputFormat {
		case "json":
			data, _ := json.MarshalIndent(boxes, "", "  ")
			fmt.Println(string(data))
		default:
			printNotebookTable(boxes)
		}
		return nil
	},
}

var notebookCreateCmd = &cobra.Command{
	Use:   "create --name <name>",
	Short: "Create a notebook",
	RunE: func(cmd *cobra.Command, args []string) error {
		name, _ := cmd.Flags().GetString("name")
		if name == "" {
			return fmt.Errorf("--name is required")
		}

		if dryRun {
			fmt.Printf("[dry-run] Would create notebook \"%s\"\n", name)
			return nil
		}

		id, err := model.CreateBox(name)
		if err != nil {
			return err
		}
		model.AppendPushReloadFiletreeEntry()
		fmt.Println(id)
		return nil
	},
}

var notebookRemoveCmd = &cobra.Command{
	Use:   "remove --id <id>",
	Short: "Remove a notebook",
	RunE: func(cmd *cobra.Command, args []string) error {
		id, _ := cmd.Flags().GetString("id")
		if id == "" {
			return fmt.Errorf("--id is required")
		}

		if dryRun {
			fmt.Printf("[dry-run] Would remove notebook %s\n", id)
			return nil
		}

		if err := model.RemoveBox(id); err != nil {
			return err
		}
		model.AppendPushReloadFiletreeEntry()
		fmt.Println(id)
		return nil
	},
}

var notebookRenameCmd = &cobra.Command{
	Use:   "rename --id <id> --name <name>",
	Short: "Rename a notebook",
	RunE: func(cmd *cobra.Command, args []string) error {
		id, _ := cmd.Flags().GetString("id")
		name, _ := cmd.Flags().GetString("name")
		if id == "" {
			return fmt.Errorf("--id is required")
		}
		if name == "" {
			return fmt.Errorf("--name is required")
		}

		if dryRun {
			fmt.Printf("[dry-run] Would rename notebook %s to \"%s\"\n", id, name)
			return nil
		}

		if err := model.RenameBox(id, name); err != nil {
			return err
		}
		model.AppendPushReloadFiletreeEntry()
		fmt.Println(id)
		return nil
	},
}

var notebookOpenCmd = &cobra.Command{
	Use:   "open --id <id>",
	Short: "Open a notebook",
	RunE: func(cmd *cobra.Command, args []string) error {
		id, _ := cmd.Flags().GetString("id")
		if id == "" {
			return fmt.Errorf("--id is required")
		}

		if dryRun {
			fmt.Printf("[dry-run] Would open notebook %s\n", id)
			return nil
		}

		existed, err := model.Mount(id)
		if err != nil {
			return err
		}
		if box := model.Conf.Box(id); nil != box {
			evt := util.NewCmdResult("mount", 0, util.PushModeBroadcast)
			evt.Data = map[string]any{
				"box":     box,
				"existed": existed,
			}
			util.PushEvent(evt)
		}
		time.Sleep(1 * time.Second)
		sql.FlushQueue()
		fmt.Println(id)
		return nil
	},
}

var notebookCloseCmd = &cobra.Command{
	Use:   "close --id <id>",
	Short: "Close a notebook",
	RunE: func(cmd *cobra.Command, args []string) error {
		id, _ := cmd.Flags().GetString("id")
		if id == "" {
			return fmt.Errorf("--id is required")
		}

		if dryRun {
			fmt.Printf("[dry-run] Would close notebook %s\n", id)
			return nil
		}

		model.Unmount(id)
		time.Sleep(1 * time.Second)
		sql.FlushQueue()
		fmt.Println(id)
		return nil
	},
}

func printNotebookTable(boxes []*model.Box) {
	w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
	fmt.Fprintln(w, "ID\tNAME\tCLOSED\tSORT")
	for _, b := range boxes {
		fmt.Fprintf(w, "%s\t%s\t%v\t%d\n", b.ID, b.Name, b.Closed, b.Sort)
	}
	w.Flush()
}

// notebookSetIconCmd 设置笔记本图标。
// icon 取值格式：emoji hex 码点（如 "1f4ca"）、emoji 字符、自定义图片路径或动态图标 URL。
var notebookSetIconCmd = &cobra.Command{
	Use:   "set-icon --id <id> --icon <icon>",
	Short: "Set a notebook icon",
	RunE: func(cmd *cobra.Command, args []string) error {
		id, _ := cmd.Flags().GetString("id")
		icon, _ := cmd.Flags().GetString("icon")
		if id == "" {
			return fmt.Errorf("--id is required")
		}
		if icon == "" {
			return fmt.Errorf("--icon is required")
		}

		// 校验笔记本存在，避免对一个不存在的 id 静默写入图标。
		exists := false
		notebooks, err := model.ListNotebooks()
		if err != nil {
			return err
		}
		for _, nb := range notebooks {
			if nb.ID == id {
				exists = true
				break
			}
		}
		if !exists {
			return fmt.Errorf("notebook not found: %s", id)
		}

		if dryRun {
			fmt.Printf("[dry-run] Would set notebook %s icon to %s\n", id, icon)
			return nil
		}

		// SetBoxIcon 内部对自定义图片名做 XSS 过滤。
		model.SetBoxIcon(id, icon)
		util.PushReloadFiletree()

		switch outputFormat {
		case "json":
			data, _ := json.MarshalIndent(map[string]string{"id": id, "icon": icon}, "", "  ")
			fmt.Println(string(data))
		default:
			fmt.Printf("%s\t%s\n", id, icon)
		}
		return nil
	},
}

// notebookRandomIconCmd 为笔记本随机换一个内置 emoji 图标。
// 传 --id 仅换该笔记本；不传则对全部笔记本各随机换一个。
var notebookRandomIconCmd = &cobra.Command{
	Use:   "random-icon [--id <id>]",
	Short: "Randomly set notebook icon(s) from built-in emojis",
	RunE: func(cmd *cobra.Command, args []string) error {
		id, _ := cmd.Flags().GetString("id")

		notebooks, err := model.ListNotebooks()
		if err != nil {
			return err
		}

		// 目标范围：传 id 仅换该笔记本；不传则对全部笔记本各随机换一个。
		targets := notebooks
		if id != "" {
			var found *model.Box
			for _, nb := range notebooks {
				if nb.ID == id {
					found = nb
					break
				}
			}
			if found == nil {
				return fmt.Errorf("notebook not found: %s", id)
			}
			targets = []*model.Box{found}
		}
		if len(targets) == 0 {
			return fmt.Errorf("no notebooks to update")
		}

		// 先把拟定的新图标算好，便于 dry-run 预览与失败回滚。
		type change struct {
			ID      string `json:"id"`
			Name    string `json:"name"`
			OldIcon string `json:"oldIcon"`
			NewIcon string `json:"newIcon"`
		}
		changes := make([]change, 0, len(targets))
		for _, nb := range targets {
			changes = append(changes, change{ID: nb.ID, Name: nb.Name, OldIcon: nb.Icon, NewIcon: randomEmoji()})
		}

		if dryRun {
			for _, c := range changes {
				fmt.Printf("[dry-run] Would set notebook %s (%s) icon %s -> %s\n", c.ID, c.Name, c.OldIcon, c.NewIcon)
			}
			return nil
		}

		for _, c := range changes {
			model.SetBoxIcon(c.ID, c.NewIcon)
		}
		util.PushReloadFiletree()

		switch outputFormat {
		case "json":
			data, _ := json.MarshalIndent(changes, "", "  ")
			fmt.Println(string(data))
		default:
			w := tabwriter.NewWriter(os.Stdout, 0, 0, 2, ' ', 0)
			fmt.Fprintln(w, "ID\tNAME\tOLD\tNEW")
			for _, c := range changes {
				fmt.Fprintf(w, "%s\t%s\t%s\t%s\n", c.ID, c.Name, c.OldIcon, c.NewIcon)
			}
			w.Flush()
		}
		return nil
	},
}

// builtinEmojiUnicodes 缓存内置 emoji 的全部 unicode 码点（来自 appearance/emojis/conf.json）。
// 与前端 getRandomEmoji() 数据源一致，但刻意排除用户自定义图片，
// 保持随机图标风格统一、避免误用用户的重要图片。
var (
	builtinEmojiUnicodes     []string
	builtinEmojiUnicodesOnce sync.Once
)

// loadBuiltinEmojiUnicodes 懒加载内置 emoji 的 unicode 列表。
// 失败时回退到一个固定码点，调用方始终拿到可用值。
func loadBuiltinEmojiUnicodes() {
	builtinEmojiUnicodesOnce.Do(func() {
		confPath := filepath.Join(util.AppearancePath, "emojis", "conf.json")
		data, err := os.ReadFile(confPath)
		if err != nil {
			builtinEmojiUnicodes = []string{"1f4d6"}
			return
		}

		var conf []map[string]any
		if err = gulu.JSON.UnmarshalJSON(data, &conf); err != nil {
			builtinEmojiUnicodes = []string{"1f4d6"}
			return
		}

		for _, category := range conf {
			items, ok := category["items"].([]any)
			if !ok {
				continue
			}
			for _, item := range items {
				e, ok := item.(map[string]any)
				if !ok {
					continue
				}
				if u, ok := e["unicode"].(string); ok && u != "" {
					builtinEmojiUnicodes = append(builtinEmojiUnicodes, u)
				}
			}
		}

		if len(builtinEmojiUnicodes) == 0 {
			builtinEmojiUnicodes = []string{"1f4d6"}
		}
	})
}

// randomEmoji 返回一个随机的内置 emoji unicode 码点（如 "1f4d6"）。
func randomEmoji() string {
	loadBuiltinEmojiUnicodes()
	return builtinEmojiUnicodes[rand.Intn(len(builtinEmojiUnicodes))]
}

func init() {
	notebookCreateCmd.Flags().String("name", "", "notebook name")
	notebookRemoveCmd.Flags().String("id", "", "notebook ID")
	notebookRenameCmd.Flags().String("id", "", "notebook ID")
	notebookRenameCmd.Flags().String("name", "", "new notebook name")
	notebookOpenCmd.Flags().String("id", "", "notebook ID")
	notebookCloseCmd.Flags().String("id", "", "notebook ID")
	notebookSetIconCmd.Flags().String("id", "", "notebook ID")
	notebookSetIconCmd.Flags().String("icon", "", "notebook icon: emoji hex codepoint like \"1f4ca\", emoji character like \"📊\", custom image path like \"1/b3log.png\", or dynamic icon URL like \"api/icon/getDynamicIcon?type=8&color=%23d23f31&content=SiYuan&id=xxx\"")
	notebookRandomIconCmd.Flags().String("id", "", "notebook ID (optional; omit to update all notebooks)")

	rootCmd.AddCommand(notebookCmd)
	notebookCmd.AddCommand(notebookListCmd)
	notebookCmd.AddCommand(notebookCreateCmd)
	notebookCmd.AddCommand(notebookRemoveCmd)
	notebookCmd.AddCommand(notebookRenameCmd)
	notebookCmd.AddCommand(notebookOpenCmd)
	notebookCmd.AddCommand(notebookCloseCmd)
	notebookCmd.AddCommand(notebookSetIconCmd)
	notebookCmd.AddCommand(notebookRandomIconCmd)
}