package ctx

import (
	"encoding/json"
	"errors"
	"os"
	"path/filepath"
	"sync"
	"time"

	"github.com/rs/zerolog/log"
	"github.com/sjzar/chatlog/internal/chatlog/conf"
	"github.com/sjzar/chatlog/internal/wechat"
	"github.com/sjzar/chatlog/pkg/config"
	"github.com/sjzar/chatlog/pkg/util"
)

const (
	DefalutHTTPAddr = "127.0.0.1:5030"
)

// Context is a context for a chatlog.
// It is used to store information about the chatlog.
type Context struct {
	conf *conf.TUIConfig
	cm   *config.Manager
	mu   sync.RWMutex

	History    map[string]conf.ProcessConfig
	speech     *conf.SpeechConfig
	speechPath string

	// 微信账号相关状态
	Account     string
	Platform    string
	Version     int
	FullVersion string
	DataDir     string
	DataKey     string
	DataUsage   string
	ImgKey      string

	// 工作目录相关状态
	WorkDir   string
	WorkUsage string

	// HTTP服务相关状态
	HTTPEnabled bool
	HTTPAddr    string

	// 自动解密
	AutoDecrypt bool
	LastSession time.Time

	// 当前选中的微信实例
	Current *wechat.Account
	PID     int
	ExePath string
	Status  string

	// 所有可用的微信实例
	WeChatInstances []*wechat.Account
}

func New(configPath string) (*Context, error) {

	conf, tcm, err := conf.LoadTUIConfig(configPath)
	if err != nil {
		return nil, err
	}

	ctx := &Context{
		conf: conf,
		cm:   tcm,
	}

	ctx.loadConfig()

	return ctx, nil
}

func (c *Context) loadConfig() {
	c.History = c.conf.ParseHistory()
	c.SwitchHistory(c.conf.LastAccount)
	c.Refresh()
	if c.cm != nil {
		speechPath := filepath.Join(c.cm.Path, "whisper.json")
		c.speechPath = speechPath
		if data, err := os.ReadFile(speechPath); err == nil {
			var sc conf.SpeechConfig
			if err := json.Unmarshal(data, &sc); err != nil {
				log.Debug().Err(err).Msg("failed to parse speech config")
			} else {
				sc.Normalize()
				c.speech = &sc
			}
		} else if os.IsNotExist(err) {
			defaultSpeech := conf.SpeechConfig{Enabled: true, Provider: "openai", Model: "whisper-1"}
			defaultSpeech.PrepareForSave()
			payload, marshalErr := json.MarshalIndent(defaultSpeech, "", "  ")
			if marshalErr != nil {
				log.Error().Err(marshalErr).Msg("failed to marshal default speech config")
			} else if writeErr := os.WriteFile(speechPath, payload, 0600); writeErr != nil {
				log.Error().Err(writeErr).Msg("failed to write default speech config")
			} else {
				defaultSpeech.Normalize()
				c.speech = &defaultSpeech
				log.Info().Str("path", speechPath).Msg("created default speech config")
			}
		}
		if c.speech != nil {
			if c.speech.Model == "" {
				c.speech.Model = "whisper-1"
			}
			c.speech.Enabled = true
		}
	}
}

func (c *Context) SaveSpeechConfig(cfg *conf.SpeechConfig) error {
	if cfg == nil {
		return errors.New("speech config is nil")
	}
	if c.cm == nil {
		return errors.New("config manager unavailable")
	}

	cfg.Enabled = true
	cfg.Normalize()
	cfg.PrepareForSave()

	path := c.speechPath
	if path == "" {
		path = filepath.Join(c.cm.Path, "whisper.json")
		c.speechPath = path
	}

	payload, err := json.MarshalIndent(cfg, "", "  ")
	if err != nil {
		return err
	}
	if err := os.WriteFile(path, payload, 0o600); err != nil {
		return err
	}

	cfgCopy := *cfg
	cfgCopy.Normalize()

	c.mu.Lock()
	defer c.mu.Unlock()
	c.speech = &cfgCopy
	return nil
}

func (c *Context) SwitchHistory(account string) {
	c.mu.Lock()
	defer c.mu.Unlock()
	c.Current = nil
	c.PID = 0
	c.ExePath = ""
	c.Status = ""
	history, ok := c.History[account]
	if ok {
		c.Account = history.Account
		c.Platform = history.Platform
		c.Version = history.Version
		c.FullVersion = history.FullVersion
		c.DataKey = history.DataKey
		c.ImgKey = history.ImgKey
		c.DataDir = history.DataDir
		c.WorkDir = history.WorkDir
		c.HTTPEnabled = history.HTTPEnabled
		c.HTTPAddr = history.HTTPAddr
	} else {
		c.Account = ""
		c.Platform = ""
		c.Version = 0
		c.FullVersion = ""
		c.DataKey = ""
		c.ImgKey = ""
		c.DataDir = ""
		c.WorkDir = ""
		c.HTTPEnabled = false
		c.HTTPAddr = ""
	}
}

func (c *Context) SwitchCurrent(info *wechat.Account) {
	c.SwitchHistory(info.Name)
	c.mu.Lock()
	defer c.mu.Unlock()
	c.Current = info
	c.Refresh()

}
func (c *Context) Refresh() {
	if c.Current != nil {
		c.Account = c.Current.Name
		c.Platform = c.Current.Platform
		c.Version = c.Current.Version
		c.FullVersion = c.Current.FullVersion
		c.PID = int(c.Current.PID)
		c.ExePath = c.Current.ExePath
		c.Status = c.Current.Status
		if c.Current.Key != "" && c.Current.Key != c.DataKey {
			c.DataKey = c.Current.Key
		}
		if c.Current.ImgKey != "" && c.Current.ImgKey != c.ImgKey {
			c.ImgKey = c.Current.ImgKey
		}
		if c.Current.DataDir != "" && c.Current.DataDir != c.DataDir {
			c.DataDir = c.Current.DataDir
		}
	}
	if c.DataUsage == "" && c.DataDir != "" {
		go func() {
			c.DataUsage = util.GetDirSize(c.DataDir)
		}()
	}
	if c.WorkUsage == "" && c.WorkDir != "" {
		go func() {
			c.WorkUsage = util.GetDirSize(c.WorkDir)
		}()
	}
}

func (c *Context) GetDataDir() string {
	return c.DataDir
}

func (c *Context) GetWorkDir() string {
	return c.WorkDir
}

func (c *Context) GetPlatform() string {
	return c.Platform
}

func (c *Context) GetVersion() int {
	return c.Version
}

func (c *Context) GetDataKey() string {
	return c.DataKey
}

func (c *Context) GetHTTPAddr() string {
	if c.HTTPAddr == "" {
		c.HTTPAddr = DefalutHTTPAddr
	}
	return c.HTTPAddr
}

func (c *Context) GetWebhook() *conf.Webhook {
	return c.conf.Webhook
}

func (c *Context) GetSpeech() *conf.SpeechConfig {
	return c.speech
}

func (c *Context) SetHTTPEnabled(enabled bool) {
	c.mu.Lock()
	defer c.mu.Unlock()
	if c.HTTPEnabled == enabled {
		return
	}
	c.HTTPEnabled = enabled
	c.UpdateConfig()
}

func (c *Context) SetHTTPAddr(addr string) {
	c.mu.Lock()
	defer c.mu.Unlock()
	if c.HTTPAddr == addr {
		return
	}
	c.HTTPAddr = addr
	c.UpdateConfig()
}

func (c *Context) SetWorkDir(dir string) {
	c.mu.Lock()
	defer c.mu.Unlock()
	if c.WorkDir == dir {
		return
	}
	c.WorkDir = dir
	c.UpdateConfig()
	c.Refresh()
}

func (c *Context) SetDataDir(dir string) {
	c.mu.Lock()
	defer c.mu.Unlock()
	if c.DataDir == dir {
		return
	}
	c.DataDir = dir
	c.UpdateConfig()
	c.Refresh()
}

func (c *Context) SetImgKey(key string) {
	c.mu.Lock()
	defer c.mu.Unlock()
	if c.ImgKey == key {
		return
	}
	c.ImgKey = key
	c.UpdateConfig()
}

func (c *Context) SetAutoDecrypt(enabled bool) {
	c.mu.Lock()
	defer c.mu.Unlock()
	if c.AutoDecrypt == enabled {
		return
	}
	c.AutoDecrypt = enabled
	c.UpdateConfig()
}

func (c *Context) SetWeChatInstances(instances []*wechat.Account) {
	c.mu.Lock()
	defer c.mu.Unlock()
	c.WeChatInstances = instances
}

// 更新配置
func (c *Context) UpdateConfig() {

	pconf := conf.ProcessConfig{
		Type:        "wechat",
		Account:     c.Account,
		Platform:    c.Platform,
		Version:     c.Version,
		FullVersion: c.FullVersion,
		DataDir:     c.DataDir,
		DataKey:     c.DataKey,
		ImgKey:      c.ImgKey,
		WorkDir:     c.WorkDir,
		HTTPEnabled: c.HTTPEnabled,
		HTTPAddr:    c.HTTPAddr,
	}

	if c.conf.History == nil {
		c.conf.History = make([]conf.ProcessConfig, 0)
	}
	if len(c.conf.History) == 0 {
		c.conf.History = append(c.conf.History, pconf)
	} else {
		isFind := false
		for i, v := range c.conf.History {
			if v.Account == c.Account {
				isFind = true
				c.conf.History[i] = pconf
				break
			}
		}
		if !isFind {
			c.conf.History = append(c.conf.History, pconf)
		}
	}

	if err := c.cm.SetConfig("last_account", c.Account); err != nil {
		log.Error().Err(err).Msg("set last_account failed")
		return
	}

	if err := c.cm.SetConfig("history", c.conf.History); err != nil {
		log.Error().Err(err).Msg("set history failed")
		return
	}

	if len(pconf.DataDir) != 0 {
		if b, err := json.Marshal(pconf); err == nil {
			if err := os.WriteFile(filepath.Join(pconf.DataDir, "chatlog.json"), b, 0644); err != nil {
				log.Error().Err(err).Msg("save chatlog.json failed")
			}
		}
	}
}