package handler

import (
	"net/http"

	"sql-platform/internal/model"

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

// GET /api/v1/instances/:id/detail/databases
func DetailListDatabases(c *gin.Context) {
	id := c.Param("id")
	var instance model.Instance
	if err := model.DB.First(&instance, id).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"detail": "Instance not found"})
		return
	}
	// TODO: actual SHOW DATABASES
	c.JSON(http.StatusOK, []string{"information_schema"})
}

// GET /api/v1/instances/:id/detail/tables
func DetailListTables(c *gin.Context) {
	id := c.Param("id")
	dbName := c.Query("database")
	var instance model.Instance
	if err := model.DB.First(&instance, id).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"detail": "Instance not found"})
		return
	}
	// TODO: actual SHOW TABLES from database
	_ = dbName
	c.JSON(http.StatusOK, []interface{}{})
}

// GET /api/v1/instances/:id/detail/db-schema
func DetailDbSchema(c *gin.Context) {
	id := c.Param("id")
	dbName := c.Query("database")
	var instance model.Instance
	if err := model.DB.First(&instance, id).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"detail": "Instance not found"})
		return
	}
	// TODO: actual schema introspection
	_ = dbName
	c.JSON(http.StatusOK, map[string]interface{}{})
}

// GET /api/v1/instances/:id/detail/table-detail
func DetailTableDetail(c *gin.Context) {
	id := c.Param("id")
	dbName := c.Query("database")
	tableName := c.Query("table")
	var instance model.Instance
	if err := model.DB.First(&instance, id).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"detail": "Instance not found"})
		return
	}
	// TODO: actual SHOW CREATE TABLE + SHOW COLUMNS + SHOW INDEX
	_, _ = dbName, tableName
	c.JSON(http.StatusOK, gin.H{
		"ddl":     "",
		"columns": []interface{}{},
		"indexes": []interface{}{},
	})
}

// GET /api/v1/instances/:id/detail/processlist
func DetailProcesslist(c *gin.Context) {
	id := c.Param("id")
	var instance model.Instance
	if err := model.DB.First(&instance, id).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"detail": "Instance not found"})
		return
	}
	// TODO: actual SHOW PROCESSLIST
	c.JSON(http.StatusOK, []interface{}{})
}

// GET /api/v1/instances/:id/detail/status
func DetailStatus(c *gin.Context) {
	id := c.Param("id")
	var instance model.Instance
	if err := model.DB.First(&instance, id).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"detail": "Instance not found"})
		return
	}
	// TODO: actual SHOW GLOBAL STATUS
	c.JSON(http.StatusOK, gin.H{
		"key_metrics": map[string]string{},
		"all_status":  []interface{}{},
	})
}

// POST /api/v1/instances/:id/detail/processlist/:pid/kill
func DetailKillProcess(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{"message": "Process killed (placeholder)"})
}

// GET /api/v1/instances/:id/detail/users
func DetailListUsers(c *gin.Context) {
	id := c.Param("id")
	var instance model.Instance
	if err := model.DB.First(&instance, id).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"detail": "Instance not found"})
		return
	}
	// TODO: actual SELECT from mysql.user
	c.JSON(http.StatusOK, []interface{}{})
}

// POST /api/v1/query/execute
func ExecuteQuery(c *gin.Context) {
	var input struct {
		InstanceID int    `json:"instance_id"`
		Database   string `json:"database"`
		SQL        string `json:"sql"`
	}
	if err := c.ShouldBindJSON(&input); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": err.Error()})
		return
	}
	// TODO: actual SQL execution
	c.JSON(http.StatusOK, gin.H{
		"columns": []interface{}{},
		"rows":    []interface{}{},
		"total":   0,
		"cost_ms": 0,
	})
}