package handler

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

	"spider/internal/model"
	"spider/internal/store"
	"spider/internal/task"

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

// ScheduleHandler handles schedule CRUD endpoints.
type ScheduleHandler struct {
	store     *store.Store
	scheduler *task.Scheduler
	taskMgr   *task.Manager
}

// SetScheduler sets the scheduler reference (called after scheduler is created).
func (h *ScheduleHandler) SetScheduler(s *task.Scheduler) {
	h.scheduler = s
}

// List handles GET /schedules
func (h *ScheduleHandler) List(c *gin.Context) {
	var jobs []model.ScheduleJob
	if err := h.store.DB.Order("id ASC").Find(&jobs).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}
	OK(c, jobs)
}

// Create handles POST /schedules
func (h *ScheduleHandler) Create(c *gin.Context) {
	var req struct {
		Name       string `json:"name" binding:"required"`
		PluginName string `json:"plugin_name" binding:"required"`
		CronExpr   string `json:"cron_expr" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		Fail(c, 400, err.Error())
		return
	}

	job := model.ScheduleJob{
		Name:       req.Name,
		PluginName: req.PluginName,
		CronExpr:   req.CronExpr,
		Enabled:    true,
	}
	if err := h.store.DB.Create(&job).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}

	if h.scheduler != nil {
		h.scheduler.Reload()
	}
	LogAudit(h.store, c, "create", "schedule", fmt.Sprintf("%d", job.ID), gin.H{"name": job.Name, "plugin": job.PluginName})
	OK(c, job)
}

// Update handles PUT /schedules/:id
func (h *ScheduleHandler) Update(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		Fail(c, 400, "invalid id")
		return
	}

	var job model.ScheduleJob
	if err := h.store.DB.First(&job, id).Error; err != nil {
		Fail(c, 404, "定时任务不存在")
		return
	}

	var req struct {
		Name     *string `json:"name"`
		CronExpr *string `json:"cron_expr"`
		Enabled  *bool   `json:"enabled"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		Fail(c, 400, err.Error())
		return
	}

	updates := map[string]any{}
	if req.Name != nil {
		updates["name"] = *req.Name
	}
	if req.CronExpr != nil {
		updates["cron_expr"] = *req.CronExpr
	}
	if req.Enabled != nil {
		updates["enabled"] = *req.Enabled
	}

	if len(updates) > 0 {
		if err := h.store.DB.Model(&job).Updates(updates).Error; err != nil {
			Fail(c, 500, err.Error())
			return
		}
	}

	// Re-read
	h.store.DB.First(&job, id)

	if h.scheduler != nil {
		h.scheduler.Reload()
	}
	LogAudit(h.store, c, "update", "schedule", fmt.Sprintf("%d", id), updates)
	OK(c, job)
}

// Delete handles DELETE /schedules/:id
func (h *ScheduleHandler) Delete(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		Fail(c, 400, "invalid id")
		return
	}

	if err := h.store.DB.Delete(&model.ScheduleJob{}, id).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}

	if h.scheduler != nil {
		h.scheduler.Reload()
	}
	LogAudit(h.store, c, "delete", "schedule", fmt.Sprintf("%d", id), nil)
	OK(c, nil)
}

// RunNow handles POST /schedules/:id/run — manually triggers a scheduled job immediately
func (h *ScheduleHandler) RunNow(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		Fail(c, 400, "invalid id")
		return
	}

	var job model.ScheduleJob
	if err := h.store.DB.First(&job, id).Error; err != nil {
		Fail(c, 404, "定时任务不存在")
		return
	}

	// Start the task using the task manager via scheduler
	req := task.StartRequest{PluginName: job.PluginName}
	taskLog, err := h.taskMgr.StartTask(req)
	if err != nil {
		Fail(c, 409, err.Error())
		return
	}

	// Update last_run_at
	now := time.Now()
	h.store.DB.Model(&job).Update("last_run_at", now)

	LogAudit(h.store, c, "create", "task", fmt.Sprintf("%d", taskLog.ID), gin.H{"trigger": "manual_schedule", "schedule_id": id})
	c.JSON(http.StatusCreated, Response{Code: 0, Message: "ok", Data: taskLog})
}