package handler

import (
	"fmt"
	"net/http"
	"strconv"
	"time"

	"kra/internal/server/httpx"
	"kra/internal/service"
	"kra/internal/service/dto"
	"kra/internal/worker"

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

type Task struct {
	service   *service.TaskService
	scheduler *worker.TaskScheduler
}

func NewTask(service *service.TaskService, scheduler *worker.TaskScheduler) *Task {
	return &Task{service: service, scheduler: scheduler}
}

func (h *Task) Create(c *gin.Context) {
	var req dto.TaskRequest
	if c.ShouldBindJSON(&req) != nil {
		httpx.Fail(c, "参数错误")
		return
	}
	id, err := h.service.CreateRequest(c.Request.Context(), &req)
	if err != nil {
		httpx.Fail(c, "创建失败:"+err.Error())
		return
	}
	if err = h.scheduler.ScheduleID(c.Request.Context(), id); err != nil {
		httpx.Fail(c, "调度失败:"+err.Error())
		return
	}
	httpx.Write(c, httpx.CodeSuccess, gin.H{}, "创建成功")
}

func (h *Task) Update(c *gin.Context) {
	var req dto.TaskRequest
	if c.ShouldBindJSON(&req) != nil {
		httpx.Fail(c, "参数错误")
		return
	}
	if err := h.service.UpdateRequest(c.Request.Context(), &req); err != nil {
		httpx.Fail(c, "更新失败:"+err.Error())
		return
	}
	if err := h.scheduler.ScheduleID(c.Request.Context(), req.ID); err != nil {
		httpx.Fail(c, "调度失败:"+err.Error())
		return
	}
	httpx.Write(c, httpx.CodeSuccess, gin.H{}, "更新成功")
}

func (h *Task) Delete(c *gin.Context) {
	var req dto.DeleteTaskRequest
	if c.ShouldBindJSON(&req) != nil || req.ID == 0 {
		httpx.Fail(c, "参数错误")
		return
	}
	h.scheduler.Remove(req.ID)
	if err := h.service.Delete(c.Request.Context(), req.ID); err != nil {
		httpx.Fail(c, "删除失败")
		return
	}
	httpx.Write(c, httpx.CodeSuccess, gin.H{}, "删除成功")
}

func (h *Task) Toggle(c *gin.Context) {
	var req dto.ToggleTaskRequest
	if c.ShouldBindJSON(&req) != nil {
		httpx.Fail(c, "参数错误")
		return
	}
	if err := h.service.Toggle(c.Request.Context(), req.ID, req.Enabled); err != nil {
		httpx.Fail(c, "操作失败: "+err.Error())
		return
	}
	if err := h.scheduler.ScheduleID(c.Request.Context(), req.ID); err != nil {
		httpx.Fail(c, "操作失败: "+err.Error())
		return
	}
	httpx.Write(c, httpx.CodeSuccess, gin.H{}, "操作成功")
}

func (h *Task) Trigger(c *gin.Context) {
	var req dto.DeleteTaskRequest
	if c.ShouldBindJSON(&req) != nil {
		httpx.Fail(c, "参数错误")
		return
	}
	if err := h.scheduler.TriggerID(c.Request.Context(), req.ID); err != nil {
		httpx.Fail(c, "触发失败: "+err.Error())
		return
	}
	httpx.Write(c, httpx.CodeSuccess, gin.H{}, "已触发, 执行结果见执行日志")
}

func (h *Task) List(c *gin.Context) {
	page, _ := strconv.Atoi(c.Query("page"))
	size, _ := strconv.Atoi(c.Query("pageSize"))
	var enabled *bool
	if raw := c.Query("enabled"); raw != "" {
		value, _ := strconv.ParseBool(raw)
		enabled = &value
	}
	items, total, err := h.service.ListRequest(c.Request.Context(), page, size, c.Query("name"), c.Query("executorType"), enabled, h.scheduler.NextRuns())
	if err != nil {
		httpx.Fail(c, "获取失败")
		return
	}
	httpx.Write(c, httpx.CodeSuccess, httpx.PageResult{List: items, Total: total, Page: page, PageSize: size}, "获取成功")
}

func (h *Task) Logs(c *gin.Context) {
	page, _ := strconv.Atoi(c.Query("page"))
	size, _ := strconv.Atoi(c.Query("pageSize"))
	taskID, _ := strconv.ParseUint(c.Query("taskId"), 10, 64)
	items, total, err := h.service.Logs(c.Request.Context(), page, size, uint(taskID), c.Query("status"))
	if err != nil {
		httpx.Fail(c, "获取失败")
		return
	}
	httpx.Write(c, httpx.CodeSuccess, httpx.PageResult{List: items, Total: total, Page: page, PageSize: size}, "获取成功")
}

func (h *Task) Methods(c *gin.Context) {
	httpx.Write(c, httpx.CodeSuccess, gin.H{"methods": h.service.RegisteredMethods()}, "获取成功")
}

func (h *Task) AlertStream(c *gin.Context) {
	c.Header("Content-Type", "text/event-stream")
	c.Header("Cache-Control", "no-cache")
	c.Header("Connection", "keep-alive")
	c.Header("X-Accel-Buffering", "no")
	flusher, ok := c.Writer.(http.Flusher)
	if !ok {
		httpx.Fail(c, "SSE 不受支持")
		return
	}
	// Remove the normal server deadline for long-lived SSE connections.
	_ = http.NewResponseController(c.Writer).SetWriteDeadline(time.Time{})
	events := h.scheduler.Subscribe()
	defer h.scheduler.Unsubscribe(events)
	ticker := time.NewTicker(20 * time.Second)
	defer ticker.Stop()
	_, _ = fmt.Fprint(c.Writer, "event: connected\ndata: {}\n\n")
	flusher.Flush()
	for {
		select {
		case event, open := <-events:
			if !open {
				return
			}
			_, _ = fmt.Fprintf(c.Writer, "event: alert\ndata: %s\n\n", event)
			flusher.Flush()
		case <-ticker.C:
			_, _ = fmt.Fprint(c.Writer, ": keepalive\n\n")
			flusher.Flush()
		case <-c.Request.Context().Done():
			return
		}
	}
}