package handler

import (
	"net/http"
	"time"

	"sql-platform/config"
	"sql-platform/internal/ghost"
	"sql-platform/internal/model"

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

// POST /api/v1/ghost/dry-run
func GhOstDryRun(c *gin.Context) {
	var task ghost.GhOstTask
	if err := c.ShouldBindJSON(&task); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": err.Error()})
		return
	}
	task.DryRun = true
	task.Execute = false

	result, err := ghost.RunGhOst(c.Request.Context(), task, config.C.GhOstPath)
	if err != nil {
		c.JSON(http.StatusInternalServerError, result)
		return
	}
	c.JSON(http.StatusOK, result)
}

// POST /api/v1/ghost/execute
func GhOstExecute(c *gin.Context) {
	var task ghost.GhOstTask
	if err := c.ShouldBindJSON(&task); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": err.Error()})
		return
	}
	task.DryRun = false
	task.Execute = true

	taskID := ghost.RunGhOstAsync(task, config.C.GhOstPath, nil)
	c.JSON(http.StatusAccepted, gin.H{
		"task_id": taskID,
		"message": "gh-ost execution started",
	})
}

// GET /api/v1/ghost/status/:taskId
func GhOstStatus(c *gin.Context) {
	taskID := c.Param("taskId")
	status, result := ghost.Manager.GetTaskStatus(taskID)
	if status == "" {
		c.JSON(http.StatusNotFound, gin.H{"detail": "Task not found"})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"task_id": taskID,
		"status":  status,
		"result":  result,
	})
}

// GET /api/v1/ghost/tasks
func GhOstListTasks(c *gin.Context) {
	tasks := ghost.Manager.ListTasks()
	c.JSON(http.StatusOK, tasks)
}

// GET /api/v1/audit-rules
func ListAuditRules(c *gin.Context) {
	var rules []model.AuditRule
	model.DB.Order("id").Find(&rules)
	c.JSON(http.StatusOK, rules)
}

// GET /api/v1/announcements
func ListAnnouncements(c *gin.Context) {
	var announcements []model.Announcement
	model.DB.Where("is_published = ?", true).Order("id DESC").Find(&announcements)
	c.JSON(http.StatusOK, announcements)
}

// GET /api/v1/query-histories
func ListQueryHistories(c *gin.Context) {
	_, _, _ = c.GetInt("user_id"), c.GetString("username"), c.GetString("role")
	
	var histories []model.QueryHistory
	model.DB.Order("id DESC").Limit(100).Find(&histories)
	c.JSON(http.StatusOK, histories)
}

// GET /api/v1/settings — returns settings grouped by `group` field
func ListSettings(c *gin.Context) {
	var settings []model.SystemSetting
	model.DB.Order("sort_order").Find(&settings)

	// group by `group` field
	grouped := make(map[string][]model.SystemSetting)
	for _, s := range settings {
		grouped[s.Group] = append(grouped[s.Group], s)
	}
	c.JSON(http.StatusOK, grouped)
}

// PUT /api/v1/settings — batch update settings
func UpdateSettings(c *gin.Context) {
	var items []struct {
		ID    int    `json:"id"`
		Value string `json:"value"`
	}
	if err := c.ShouldBindJSON(&items); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": err.Error()})
		return
	}
	for _, item := range items {
		model.DB.Model(&model.SystemSetting{}).Where("id = ?", item.ID).Update("value", item.Value)
	}
	c.JSON(http.StatusOK, gin.H{"message": "Settings updated"})
}

// GET /api/v1/settings/cleanup/preview
func SettingsCleanupPreview(c *gin.Context) {
	c.JSON(http.StatusOK, map[string]interface{}{})
}

// POST /api/v1/settings/cleanup/run
func SettingsCleanupRun(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{"message": "Cleanup done (placeholder)", "stats": map[string]interface{}{}})
}

// GET /api/v1/notifications/channels
func ListNotificationChannels(c *gin.Context) {
	var channels []model.NotificationChannel
	model.DB.Order("id").Find(&channels)
	c.JSON(http.StatusOK, channels)
}

// GET /api/v1/notifications/templates
func ListNotificationTemplates(c *gin.Context) {
	var templates []model.NotificationTemplate
	model.DB.Order("id").Find(&templates)
	c.JSON(http.StatusOK, templates)
}

// GET /api/v1/workflows
func ListWorkflows(c *gin.Context) {
	var workflows []model.WorkflowDefinition
	model.DB.Order("id").Find(&workflows)

	type WorkflowWithSteps struct {
		model.WorkflowDefinition
		Steps []model.WorkflowStep `json:"steps"`
	}

	result := make([]WorkflowWithSteps, len(workflows))
	for i, wf := range workflows {
		result[i] = WorkflowWithSteps{WorkflowDefinition: wf, Steps: []model.WorkflowStep{}}
		model.DB.Where("workflow_id = ?", wf.ID).Order("step_number").Find(&result[i].Steps)
	}
	c.JSON(http.StatusOK, result)
}

// GET /api/v1/instance-groups
func ListInstanceGroups(c *gin.Context) {
	var groups []model.InstanceGroup
	model.DB.Order("id").Find(&groups)
	c.JSON(http.StatusOK, groups)
}

// POST /api/v1/notifications/test
func TestNotification(c *gin.Context) {
	_ = time.Now()
	c.JSON(http.StatusOK, gin.H{"message": "Notification sent (placeholder)"})
}