package web

import (
	"context"
	"errors"
	"log"
	"net/http"
	"net/url"
	"strings"
	"time"

	"github.com/gin-gonic/gin"

	"cmautobuy/admin/service"
)

func (h *Handler) SybAIMatchCreate(c *gin.Context) {
	actor := currentUser(c)
	snapshot, err := service.LoadActiveAIMatchSnapshot(c.Request.Context(), h.db, h.aiSecrets, h.aiPolicy)
	if err != nil {
		h.sybRedirectAIMatchError(c, "AI 规格匹配未开始："+err.Error())
		return
	}
	batch, err := service.CreateAIMatchBatch(h.db, actor, c.PostFormArray("ids"), snapshot, time.Now())
	if err != nil {
		message := "AI 规格匹配批次未创建，数据没有被改动。"
		if service.IsValidationError(err) {
			message = "AI 规格匹配未开始：" + err.Error()
		}
		h.sybRedirectAIMatchError(c, message)
		return
	}
	actorCopy := *actor
	go func() {
		if runErr := service.RunAIMatchBatch(context.Background(), h.db, actorCopy, batch.BatchID, snapshot); runErr != nil {
			log.Printf("ai_match_batch_failed batch_id=%s error=%v", batch.BatchID, runErr)
			if interruptErr := service.MarkAIMatchBatchInterrupted(h.db, batch.BatchID); interruptErr != nil {
				log.Printf("ai_match_batch_interrupt_failed batch_id=%s error=%v", batch.BatchID, interruptErr)
			}
		}
	}()
	h.sybRedirectAIMatch(c, batch.BatchID, "AI 规格匹配已开始，可在进度窗口查看逐条结果")
}

// sybRedirectAIMatchError 使用独立参数返回列表，让页面明确弹出 AI 失败提示。
// 普通列表状态仍使用 msg，避免同步、采集等操作结果被误当成 AI 错误。
func (h *Handler) sybRedirectAIMatchError(c *gin.Context, message string) {
	params := url.Values{}
	appendSybFormState(params, c)
	if message != "" {
		params.Set("ai_error", strings.TrimSpace(message))
	}
	c.Redirect(http.StatusSeeOther, "/syb?"+params.Encode())
}

func (h *Handler) SybAIMatchStatus(c *gin.Context) {
	view, err := service.GetAIMatchBatchView(h.db, currentUser(c), c.Param("batch_id"))
	if errors.Is(err, service.ErrForbidden) {
		c.JSON(http.StatusForbidden, gin.H{"error": "没有权限查看这个 AI 匹配批次"})
		return
	}
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "读取 AI 匹配进度失败，请稍后重试"})
		return
	}
	if view == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "AI 匹配批次不存在"})
		return
	}
	c.JSON(http.StatusOK, view)
}

func (h *Handler) sybRedirectAIMatch(c *gin.Context, batchID, message string) {
	params := url.Values{}
	appendSybFormState(params, c)
	params.Set("ai_batch_id", strings.TrimSpace(batchID))
	if message != "" {
		params.Set("msg", message)
	}
	c.Redirect(http.StatusSeeOther, "/syb?"+params.Encode())
}