package controller

import (
	"errors"
	"fmt"
	"strconv"
	"strings"
	"time"

	"github.com/QuantumNous/new-api/common"
	"github.com/QuantumNous/new-api/model"
	"github.com/QuantumNous/new-api/service"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

type createChannelMonitorRequest struct {
	Name             string `json:"name"`
	ChannelId        int    `json:"channel_id"`
	TargetUrl        string `json:"target_url"`
	PrimaryModel     string `json:"primary_model"`
	ExtraModels      string `json:"extra_models"`
	CheckInterval    int    `json:"check_interval"`
	Timeout          int    `json:"timeout"`
	RequestTemplates string `json:"request_templates"`
	CustomHeaders    string `json:"custom_headers"`
	CustomBody       string `json:"custom_body"`
	Status           *int   `json:"status"`
}

type updateChannelMonitorRequest struct {
	Name             *string `json:"name"`
	ChannelId        *int    `json:"channel_id"`
	TargetUrl        *string `json:"target_url"`
	PrimaryModel     *string `json:"primary_model"`
	ExtraModels      *string `json:"extra_models"`
	CheckInterval    *int    `json:"check_interval"`
	Timeout          *int    `json:"timeout"`
	RequestTemplates *string `json:"request_templates"`
	CustomHeaders    *string `json:"custom_headers"`
	CustomBody       *string `json:"custom_body"`
	Status           *int    `json:"status"`
}

func GetChannelMonitors(c *gin.Context) {
	pageInfo := getChannelMonitorPageQuery(c)
	monitors, total, err := model.GetChannelMonitors(pageInfo.GetPage(), pageInfo.GetPageSize())
	if err != nil {
		common.ApiError(c, err)
		return
	}
	pageInfo.SetTotal(int(total))
	pageInfo.SetItems(monitors)
	common.ApiSuccess(c, pageInfo)
}

func CreateChannelMonitor(c *gin.Context) {
	var req createChannelMonitorRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		common.ApiError(c, err)
		return
	}

	monitor := &model.ChannelMonitor{
		Name:             strings.TrimSpace(req.Name),
		ChannelId:        req.ChannelId,
		TargetUrl:        strings.TrimSpace(req.TargetUrl),
		PrimaryModel:     strings.TrimSpace(req.PrimaryModel),
		ExtraModels:      strings.TrimSpace(req.ExtraModels),
		CheckInterval:    req.CheckInterval,
		Timeout:          req.Timeout,
		RequestTemplates: strings.TrimSpace(req.RequestTemplates),
		CustomHeaders:    strings.TrimSpace(req.CustomHeaders),
		CustomBody:       req.CustomBody,
		Status:           1,
	}
	if req.Status != nil {
		monitor.Status = *req.Status
	}
	if monitor.CheckInterval == 0 {
		monitor.CheckInterval = 300
	}
	if monitor.Timeout == 0 {
		monitor.Timeout = 30
	}

	if err := validateChannelMonitor(monitor); err != nil {
		common.ApiErrorMsg(c, err.Error())
		return
	}
	if err := monitor.Insert(); err != nil {
		common.ApiError(c, err)
		return
	}
	common.ApiSuccess(c, monitor)
}

func GetChannelMonitor(c *gin.Context) {
	monitor, ok := getChannelMonitorFromParam(c)
	if !ok {
		return
	}
	common.ApiSuccess(c, monitor)
}

func UpdateChannelMonitor(c *gin.Context) {
	monitor, ok := getChannelMonitorFromParam(c)
	if !ok {
		return
	}

	var req updateChannelMonitorRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		common.ApiError(c, err)
		return
	}

	if req.Name != nil {
		monitor.Name = strings.TrimSpace(*req.Name)
	}
	if req.ChannelId != nil {
		monitor.ChannelId = *req.ChannelId
	}
	if req.TargetUrl != nil {
		monitor.TargetUrl = strings.TrimSpace(*req.TargetUrl)
	}
	if req.PrimaryModel != nil {
		monitor.PrimaryModel = strings.TrimSpace(*req.PrimaryModel)
	}
	if req.ExtraModels != nil {
		monitor.ExtraModels = strings.TrimSpace(*req.ExtraModels)
	}
	if req.CheckInterval != nil {
		monitor.CheckInterval = *req.CheckInterval
	}
	if req.Timeout != nil {
		monitor.Timeout = *req.Timeout
	}
	if req.RequestTemplates != nil {
		monitor.RequestTemplates = strings.TrimSpace(*req.RequestTemplates)
	}
	if req.CustomHeaders != nil {
		monitor.CustomHeaders = strings.TrimSpace(*req.CustomHeaders)
	}
	if req.CustomBody != nil {
		monitor.CustomBody = *req.CustomBody
	}
	if req.Status != nil {
		monitor.Status = *req.Status
	}

	if err := validateChannelMonitor(monitor); err != nil {
		common.ApiErrorMsg(c, err.Error())
		return
	}
	if err := monitor.Update(); err != nil {
		common.ApiError(c, err)
		return
	}
	common.ApiSuccess(c, monitor)
}

func DeleteChannelMonitor(c *gin.Context) {
	monitor, ok := getChannelMonitorFromParam(c)
	if !ok {
		return
	}
	monitor.Status = 0
	if err := monitor.Update(); err != nil {
		common.ApiError(c, err)
		return
	}
	common.ApiSuccess(c, nil)
}

func RunChannelMonitorCheck(c *gin.Context) {
	monitor, ok := getChannelMonitorFromParam(c)
	if !ok {
		return
	}
	if err := service.RunMonitorCheck(monitor); err != nil {
		common.ApiError(c, err)
		return
	}
	common.ApiSuccess(c, gin.H{"message": "检查已完成"})
}

func GetChannelMonitorHistory(c *gin.Context) {
	monitor, ok := getChannelMonitorFromParam(c)
	if !ok {
		return
	}

	pageInfo := getChannelMonitorPageQuery(c)
	startTime, ok := parseChannelMonitorOptionalTime(c, "start_time")
	if !ok {
		return
	}
	endTime, ok := parseChannelMonitorOptionalTime(c, "end_time")
	if !ok {
		return
	}

	histories, total, err := model.GetMonitorHistory(
		monitor.Id,
		pageInfo.GetPage(),
		pageInfo.GetPageSize(),
		strings.TrimSpace(c.Query("model_name")),
		strings.TrimSpace(c.Query("status")),
		startTime,
		endTime,
	)
	if err != nil {
		common.ApiError(c, err)
		return
	}
	pageInfo.SetTotal(int(total))
	pageInfo.SetItems(histories)
	common.ApiSuccess(c, pageInfo)
}

func GetChannelMonitorRollup(c *gin.Context) {
	monitor, ok := getChannelMonitorFromParam(c)
	if !ok {
		return
	}

	startDate := strings.TrimSpace(c.Query("start_date"))
	endDate := strings.TrimSpace(c.Query("end_date"))
	if err := validateChannelMonitorDateRange(startDate, endDate); err != nil {
		common.ApiErrorMsg(c, err.Error())
		return
	}

	rollups, err := model.GetMonitorDailyRollups(
		monitor.Id,
		strings.TrimSpace(c.Query("model_name")),
		startDate,
		endDate,
	)
	if err != nil {
		common.ApiError(c, err)
		return
	}
	common.ApiSuccess(c, rollups)
}

func getChannelMonitorFromParam(c *gin.Context) (*model.ChannelMonitor, bool) {
	id, err := strconv.Atoi(c.Param("id"))
	if err != nil {
		common.ApiError(c, err)
		return nil, false
	}
	monitor, err := model.GetChannelMonitorByID(id)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			common.ApiErrorMsg(c, "渠道监控不存在")
			return nil, false
		}
		common.ApiError(c, err)
		return nil, false
	}
	return monitor, true
}

func getChannelMonitorPageQuery(c *gin.Context) *common.PageInfo {
	pageInfo := common.GetPageQuery(c)
	if c.Query("p") == "" {
		if page, err := strconv.Atoi(c.Query("page")); err == nil && page > 0 {
			pageInfo.Page = page
		}
	}
	return pageInfo
}

func validateChannelMonitor(monitor *model.ChannelMonitor) error {
	if strings.TrimSpace(monitor.Name) == "" {
		return errors.New("name 不能为空")
	}
	if strings.TrimSpace(monitor.TargetUrl) == "" {
		return errors.New("target_url 不能为空")
	}
	if strings.TrimSpace(monitor.PrimaryModel) == "" {
		return errors.New("primary_model 不能为空")
	}
	if monitor.CheckInterval < 15 || monitor.CheckInterval > 3600 {
		return errors.New("check_interval 必须在 15 到 3600 之间")
	}
	if monitor.Timeout < 1 || monitor.Timeout > 300 {
		return errors.New("timeout 必须在 1 到 300 之间")
	}
	if monitor.Status != 0 && monitor.Status != 1 {
		return errors.New("status 必须是 0 或 1")
	}
	if err := service.ValidateChannelMonitorTargetURL(monitor.TargetUrl); err != nil {
		return fmt.Errorf("target_url 不合法: %w", err)
	}
	if err := validateChannelMonitorJSONStringArray(monitor.ExtraModels, "extra_models"); err != nil {
		return err
	}
	if err := validateChannelMonitorJSONStringArray(monitor.RequestTemplates, "request_templates"); err != nil {
		return err
	}
	if err := validateChannelMonitorJSONHeaders(monitor.CustomHeaders); err != nil {
		return err
	}
	return nil
}

func validateChannelMonitorJSONStringArray(raw string, field string) error {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return nil
	}

	var values []string
	if err := common.Unmarshal([]byte(raw), &values); err != nil {
		return fmt.Errorf("%s 必须是 JSON 字符串数组", field)
	}
	for _, value := range values {
		if strings.TrimSpace(value) == "" {
			return fmt.Errorf("%s 不能包含空字符串", field)
		}
	}
	return nil
}

func validateChannelMonitorJSONHeaders(raw string) error {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return nil
	}

	var headers map[string]string
	if err := common.Unmarshal([]byte(raw), &headers); err != nil {
		return errors.New("custom_headers 必须是 JSON 字符串对象")
	}
	for key := range headers {
		if strings.TrimSpace(key) == "" {
			return errors.New("custom_headers 不能包含空 header 名")
		}
	}
	return nil
}

func parseChannelMonitorOptionalTime(c *gin.Context, key string) (*time.Time, bool) {
	value := strings.TrimSpace(c.Query(key))
	if value == "" {
		return nil, true
	}
	parsed, err := time.Parse(time.RFC3339, value)
	if err != nil {
		common.ApiErrorMsg(c, key+" 必须是 RFC3339 格式")
		return nil, false
	}
	return &parsed, true
}

func validateChannelMonitorDateRange(startDate string, endDate string) error {
	if startDate != "" {
		if _, err := time.Parse("2006-01-02", startDate); err != nil {
			return errors.New("start_date 必须是 YYYY-MM-DD 格式")
		}
	}
	if endDate != "" {
		if _, err := time.Parse("2006-01-02", endDate); err != nil {
			return errors.New("end_date 必须是 YYYY-MM-DD 格式")
		}
	}
	return nil
}