package handler

import (
	"net/http"
	"strconv"

	"tcm-agent/internal/dao"

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

// ========================================================================
//  HistoryHandler —— AI 生成历史（DB 长期数据）只读查询
//  ========================================================================
//  暴露 3 个端点（前缀 /api/v1/agent）：
//    GET /history         分页列表（场景/状态/via_agent/供应商/日期筛选）
//    GET /history/:id     单条详情 + 步骤时间线
//    GET /history/scenes  出现过的场景列表（前端筛选下拉）
//
//  与 /agent/runs 的区别：
//    - runs：内存环形缓冲，最近 200 条，含守卫拦截等"没到 PHP"的运行，重启清零
//    - history：读 PHP 落库的 xk_ai_generation(_step)，长期审计视角，只读
// ========================================================================

// HistoryHandler 历史查询处理器
type HistoryHandler struct{}

// NewHistoryHandler 构造
func NewHistoryHandler() *HistoryHandler {
	return &HistoryHandler{}
}

// List 分页查询历史
// GET /api/v1/agent/history?page=1&size=20&scene=&status=-1&via_agent=-1&is_archived=-1&is_correct=-1&provider=&date_start=0&date_end=0
func (h *HistoryHandler) List(c *gin.Context) {
	filter := dao.AIGenerationListFilter{
		Page:       queryInt(c, "page", 1),
		Size:       queryInt(c, "size", 20),
		Scene:      c.Query("scene"),
		Status:     queryInt(c, "status", -1),
		ViaAgent:   queryInt(c, "via_agent", -1),
		Provider:   c.Query("provider"),
		IsArchived: queryInt(c, "is_archived", -1),
		IsCorrect:  queryInt(c, "is_correct", -1),
	}
	filter.DateStart = int64(queryInt(c, "date_start", 0))
	filter.DateEnd = int64(queryInt(c, "date_end", 0))

	rows, total, err := dao.AIGenerationList(filter)
	if err != nil {
		c.JSON(http.StatusOK, gin.H{"code": 500, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"code": 200, "data": gin.H{
		"list":  rows,
		"total": total,
		"page":  filter.Page,
		"size":  filter.Size,
	}})
}

// Detail 单条详情 + 步骤
// GET /api/v1/agent/history/:id
func (h *HistoryHandler) Detail(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil || id == 0 {
		c.JSON(http.StatusOK, gin.H{"code": 400, "message": "id 参数无效"})
		return
	}
	row, steps, err := dao.AIGenerationGet(uint(id))
	if err != nil {
		c.JSON(http.StatusOK, gin.H{"code": 404, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"code": 200, "data": gin.H{
		"generation": row,
		"steps":      steps,
	}})
}

// Scenes 场景下拉数据
// GET /api/v1/agent/history/scenes
func (h *HistoryHandler) Scenes(c *gin.Context) {
	scenes, err := dao.AIGenerationScenes()
	if err != nil {
		c.JSON(http.StatusOK, gin.H{"code": 500, "message": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"code": 200, "data": scenes})
}

// queryInt 读取整型 query 参数，缺失或非法时返回默认值
func queryInt(c *gin.Context, key string, def int) int {
	v := c.Query(key)
	if v == "" {
		return def
	}
	n, err := strconv.Atoi(v)
	if err != nil {
		return def
	}
	return n
}