package server

import (
	"context"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
	"os"
	"path/filepath"
	"strings"

	"chat-agent-system/internal/bizdev"
	"chat-agent-system/internal/squad"
	"chat-agent-system/internal/taskrun"
)

// FinalizeTaskRunProjection 将任务执行结果投影到 workflow_runs 与聊天助手消息（供回填/管理命令使用）。
func (s *Server) FinalizeTaskRunProjection(ctx context.Context, record *taskrun.RunRecord, result *bizdev.TaskRunResult) (string, error) {
	return s.finalizeTaskRun(ctx, record, result)
}

// finalizeTaskRun 将任务执行结果投影到 workflow_runs 与聊天助手消息。
func (s *Server) finalizeTaskRun(ctx context.Context, record *taskrun.RunRecord, result *bizdev.TaskRunResult) (string, error) {
	if record == nil || result == nil {
		return "failed", fmt.Errorf("finalize: missing record or result")
	}

	workspaceID := result.WorkDir
	if workspaceID == "" {
		workspaceID = record.WorkspaceID
	}

	terminalStatus := resolveTerminalStatus(result)
	summaryContent := buildTaskCompletionSummary(result, terminalStatus)

	docID := ""
	artifactTitle := result.ArtifactTitle
	sha256Hex := ""
	if result.DocRecord != nil {
		docID = result.DocRecord.DocID
		if result.DocRecord.ContentSHA256 != "" {
			sha256Hex = result.DocRecord.ContentSHA256
		}
	}
	if docID == "" && record.ProjectID > 0 && record.TaskKey != "" {
		docID = fmt.Sprintf("doc_proj%d_%s", record.ProjectID, record.TaskKey)
	}
	if artifactTitle == "" && record.TaskKey != "" {
		artifactTitle = squad.TaskArtifactTitle(record.TaskKey)
	}

	if sha256Hex == "" && workspaceID != "" {
		if computed, err := hashOutputFile(workspaceID); err == nil {
			sha256Hex = computed
		}
	}

	meta := map[string]any{
		"run_id":       record.RunID,
		"workspace_id": workspaceID,
		"task_status":  terminalStatus,
		"task_key":     record.TaskKey,
	}
	if record.ProjectID > 0 {
		meta["project_id"] = record.ProjectID
	}
	if docID != "" {
		artifact := map[string]any{
			"doc_id":       docID,
			"title":        artifactTitle,
			"task_key":     record.TaskKey,
			"workspace_id": workspaceID,
		}
		if sha256Hex != "" {
			artifact["sha256"] = sha256Hex
		}
		if result.QualityReport != nil {
			artifact["quality_passed"] = result.QualityReport.Passed
			artifact["quality_score"] = result.QualityReport.Score
			if len(result.QualityReport.Violations) > 0 {
				artifact["quality_violations"] = result.QualityReport.Violations
			}
		}
		meta["artifact"] = artifact
	}

	if s.pwSvc != nil && record.ProjectID > 0 && record.RunID != "" {
		if err := s.pwSvc.UpdateWorkflowRun(ctx, record.RunID, terminalStatus, docID, artifactTitle, ""); err != nil {
			return "finalizing_failed", fmt.Errorf("update workflow run: %w", err)
		}
	}

	if s.svc != nil && s.svc.ContextManager() != nil && record.AssistantMsgID > 0 {
		if err := s.svc.ContextManager().FinalizeAssistantTaskMessage(ctx, record.AssistantMsgID, summaryContent, meta, terminalStatus); err != nil {
			return "finalizing_failed", fmt.Errorf("finalize assistant message: %w", err)
		}
	}

	return terminalStatus, nil
}

func resolveTerminalStatus(result *bizdev.TaskRunResult) string {
	if result == nil || !result.Success {
		return "failed"
	}
	if result.QualityReport != nil && !result.QualityReport.Passed {
		return "quality_failed"
	}
	return "completed"
}

func buildTaskCompletionSummary(result *bizdev.TaskRunResult, terminalStatus string) string {
	title := result.ArtifactTitle
	if title == "" && result.TaskKey != "" {
		title = squad.TaskArtifactTitle(result.TaskKey)
	}
	if title == "" {
		title = "交付文档"
	}

	var b strings.Builder
	fmt.Fprintf(&b, "《%s》已生成。\n\n", title)

	switch terminalStatus {
	case "quality_failed":
		b.WriteString("当前状态：**质量检查未通过，待整改**")
		if result.QualityReport != nil {
			fmt.Fprintf(&b, "\n质量评分：%.0f/100", result.QualityReport.Score)
			if len(result.QualityReport.Violations) > 0 {
				fmt.Fprintf(&b, "\n主要问题：%s", strings.Join(result.QualityReport.Violations, "；"))
			}
		}
	case "completed":
		b.WriteString("当前状态：**已完成**")
		if result.QualityReport != nil && result.QualityReport.Passed {
			fmt.Fprintf(&b, "\n质量评分：%.0f/100", result.QualityReport.Score)
		}
	default:
		if result.ErrorReason != "" {
			fmt.Fprintf(&b, "执行未成功：%s", result.ErrorReason)
		} else {
			b.WriteString("任务执行失败。")
		}
	}

	if result.DocRecord != nil && result.DocRecord.DocID != "" {
		fmt.Fprintf(&b, "\n\n📄 受控文档：`%s`", result.DocRecord.DocID)
	}

	return b.String()
}

func hashOutputFile(workDir string) (string, error) {
	path := filepath.Join(workDir, "output.md")
	data, err := os.ReadFile(path)
	if err != nil {
		return "", err
	}
	if len(data) == 0 {
		return "", fmt.Errorf("output.md is empty")
	}
	sum := sha256.Sum256(data)
	return hex.EncodeToString(sum[:]), nil
}

func squadResultToTaskRun(res *squad.SquadRunResult, taskKey string) *bizdev.TaskRunResult {
	if res == nil {
		return nil
	}
	return &bizdev.TaskRunResult{
		TaskKey:       res.TaskKey,
		ArtifactTitle: res.ArtifactTitle,
		MarkdownBody:  res.MarkdownBody,
		ExtractedData: res.ExtractedData,
		Attachments:   res.Attachments,
		WorkDir:       res.WorkDir,
		BackendUsed:   res.BackendUsed,
		Duration:      res.Duration,
		Success:       res.Success,
		ErrorReason:   res.ErrorReason,
		QualityReport: res.QualityReport,
		Manifest:      res.Manifest,
		AdvisorBrief:  res.AdvisorBrief,
	}
}