#!/usr/bin/env node

/**
 * Linear 이슈 상태 동기화 스크립트
 * GitHub 이벤트에 따라 Linear 이슈 상태를 자동으로 업데이트
 */

// Simple command line argument parsing without commander dependency

// 임시 Linear 클라이언트 (실제 구현 시 SDK 사용)
class LinearClient {
  constructor({ apiKey }) {
    this.apiKey = apiKey;
    this.baseUrl = "https://api.linear.app/graphql";
  }

  async query(query, variables = {}) {
    const response = await fetch(this.baseUrl, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
        Authorization: this.apiKey,
      },
      body: JSON.stringify({ query, variables }),
    });

    const data = await response.json();
    if (data.errors) {
      throw new Error(`Linear API Error: ${JSON.stringify(data.errors)}`);
    }
    return data.data;
  }

  async getIssue(issueId) {
    const query = `
      query GetIssue($id: String!) {
        issue(id: $id) {
          id
          identifier
          title
          state {
            id
            name
          }
          team {
            id
            name
          }
        }
      }
    `;
    const result = await this.query(query, { id: issueId });
    return result.issue;
  }

  async updateIssue(issueId, input) {
    const query = `
      mutation UpdateIssue($id: String!, $input: IssueUpdateInput!) {
        issueUpdate(id: $id, input: $input) {
          success
          issue {
            id
            state {
              name
            }
          }
        }
      }
    `;
    const result = await this.query(query, { id: issueId, input });
    return result.issueUpdate;
  }

  async getWorkflowStates(teamId) {
    const query = `
      query GetWorkflowStates($teamId: ID!) {
        workflowStates(filter: { team: { id: { eq: $teamId } } }) {
          nodes {
            id
            name
            type
          }
        }
      }
    `;
    const result = await this.query(query, { teamId });
    return result.workflowStates.nodes;
  }

  async createComment(issueId, body) {
    const query = `
      mutation CreateComment($issueId: String!, $body: String!) {
        commentCreate(input: { issueId: $issueId, body: $body }) {
          success
          comment {
            id
            body
          }
        }
      }
    `;
    const result = await this.query(query, { issueId, body });
    return result.commentCreate;
  }
}

// Simple command line argument parsing
const args = process.argv.slice(2);
const options = {
  issueId: null,
  event: null,
  action: null,
  prUrl: null,
  prAuthor: null,
  prMerged: "false",
  apiKey: null,
};

// Extract arguments
args.forEach((arg) => {
  if (arg.startsWith("--issue-id=")) {
    options.issueId = arg.split("=")[1];
  } else if (arg.startsWith("--event=")) {
    options.event = arg.split("=")[1];
  } else if (arg.startsWith("--action=")) {
    options.action = arg.split("=")[1];
  } else if (arg.startsWith("--pr-url=")) {
    options.prUrl = arg.split("=")[1];
  } else if (arg.startsWith("--pr-author=")) {
    options.prAuthor = arg.split("=")[1];
  } else if (arg.startsWith("--pr-merged=")) {
    options.prMerged = arg.split("=")[1];
  } else if (arg.startsWith("--api-key=")) {
    options.apiKey = arg.split("=")[1];
  }
});

// Linear 클라이언트 초기화
const apiKey = options.apiKey || process.env.LINEAR_API_KEY;
if (!apiKey) {
  console.error("Error: Linear API key not provided");
  process.exit(1);
}

const linear = new LinearClient({ apiKey });

/**
 * 이슈 상태 업데이트
 */
async function updateIssueStatus() {
  try {
    if (!options.issueId) {
      console.log("No Linear issue ID provided, skipping");
      return;
    }

    console.log(`Processing Linear issue: ${options.issueId}`);

    // 이슈 조회
    const issue = await linear.getIssue(options.issueId);

    if (!issue) {
      console.error(`Issue ${options.issueId} not found`);
      return;
    }

    console.log(`Found issue: ${issue.identifier} - ${issue.title}`);
    console.log(`Current state: ${issue.state.name}`);

    // 상태 변경 로직
    let newStateName = null;
    let comment = null;

    if (options.event === "pull_request") {
      switch (options.action) {
        case "opened":
          newStateName = "In Progress";
          comment = `🔗 Pull Request opened: ${options.prUrl}\nAuthor: @${options.prAuthor}`;
          break;

        case "ready_for_review":
          newStateName = "In Review";
          comment = `👀 Pull Request is ready for review: ${options.prUrl}`;
          break;

        case "closed":
          if (options.prMerged === "true") {
            newStateName = "Done";
            comment = `✅ Pull Request merged: ${options.prUrl}`;
          } else {
            comment = `❌ Pull Request closed without merging: ${options.prUrl}`;
          }
          break;
      }
    } else if (options.event === "push" && options.action === "commit") {
      // 커밋 푸시 시 In Progress로 변경
      if (issue.state.name === "Todo" || issue.state.name === "Backlog") {
        newStateName = "In Progress";
        comment = `💻 Work started with new commits`;
      }
    }

    // 상태 업데이트 필요시
    if (newStateName && newStateName !== issue.state.name) {
      console.log(`Updating state: ${issue.state.name} → ${newStateName}`);

      // 팀의 워크플로우 상태 조회
      const states = await linear.getWorkflowStates(issue.team.id);
      const targetState = states.find((s) => s.name === newStateName);

      if (targetState) {
        const result = await linear.updateIssue(issue.id, {
          stateId: targetState.id,
        });

        if (result.success) {
          console.log(
            `✅ Successfully updated issue state to: ${newStateName}`
          );
        } else {
          console.error("Failed to update issue state");
        }
      } else {
        console.warn(`State "${newStateName}" not found in team workflow`);
      }
    }

    // 코멘트 추가
    if (comment) {
      const commentResult = await linear.createComment(issue.id, comment);
      if (commentResult.success) {
        console.log("✅ Added comment to issue");
      }
    }
  } catch (error) {
    console.error("Error syncing with Linear:", error.message);
    process.exit(1);
  }
}

/**
 * 디버그 정보 출력
 */
function debugInfo() {
  console.log("\n=== Linear Sync Debug Info ===");
  console.log("Options:", {
    issueId: options.issueId,
    event: options.event,
    action: options.action,
    prUrl: options.prUrl,
    prAuthor: options.prAuthor,
    prMerged: options.prMerged,
  });
  console.log("API Key:", apiKey ? "Provided" : "Missing");
  console.log("==============================\n");
}

// 메인 실행
async function main() {
  console.log("🔄 Starting Linear sync...");

  if (process.env.DEBUG) {
    debugInfo();
  }

  await updateIssueStatus();

  console.log("✅ Linear sync completed");
}

// 실행
main().catch((error) => {
  console.error("Fatal error:", error);
  process.exit(1);
});