name: Create Linear Issue on Pull Request

on:
    workflow_dispatch:
    pull_request:
        branches: [main]
        types: [opened]

permissions:
    pull-requests: write

jobs:
    create-linear-issue-on-pull-request:
        runs-on: ubuntu-latest
        steps:
            - name: Check for existing Linear link
              id: check-linear
              uses: actions/github-script@v6
              with:
                  result-encoding: string
                  script: |
                      const pr = context.payload.pull_request;
                      // 1) PR body
                      if (/https?:\/\/linear\.app/.test(pr.body||"")) {
                        return "true";
                      }
                      // 2) Any linked GitHub issues?
                      const res = await github.graphql(
                        `query($owner:String!,$repo:String!,$prNumber:Int!){
                           repository(owner:$owner,name:$repo){
                             pullRequest(number:$prNumber){
                               closingIssuesReferences(first:10){
                                 nodes{number}
                               }
                             }
                           }
                         }`,
                        {
                          owner: context.repo.owner,
                          repo: context.repo.repo,
                          prNumber: pr.number
                        }
                      );
                      for (const {number} of res.repository.pullRequest.closingIssuesReferences.nodes) {
                        const comments = await github.rest.issues.listComments({
                          owner: context.repo.owner,
                          repo: context.repo.repo,
                          issue_number: number
                        });
                        if (comments.data.some(c=>/https?:\/\/linear\.app/.test(c.body))) {
                          return "true";
                        }
                      }
                      return "false";

            - name: Find or create Linear issue via GraphQL
              if: steps.check-linear.outputs.result == 'false'
              id: linear
              uses: actions/github-script@v6
              env:
                  LINEAR_API_KEY: ${{ secrets.LINEAR_API_KEY }}
              with:
                  result-encoding: string
                  script: |
                      const API = 'https://api.linear.app/graphql';
                      const apiKey = process.env.LINEAR_API_KEY;

                      // Check if API key exists
                      if (!apiKey) {
                        core.setFailed('LINEAR_API_KEY is not set. Please add it to your repository secrets.');
                        core.setOutput('error', 'true');
                        core.setOutput('error-message', 'LINEAR_API_KEY is not set. Please add it to your repository secrets.');
                        return;
                      }

                      // Helper to call Linear with error handling
                      async function gql(q, v) {
                        try {
                          const r = await fetch(API, {
                            method:'POST',
                            headers:{
                              'Content-Type':'application/json',
                              'Authorization': apiKey
                            },
                            body: JSON.stringify({ query: q, variables: v })
                          });
                          
                          if (!r.ok) {
                            throw new Error(`Linear API responded with status ${r.status}: ${await r.text()}`);
                          }
                          
                          const json = await r.json();
                          
                          // Check for GraphQL errors
                          if (json.errors && json.errors.length > 0) {
                            const errorMessages = json.errors.map(e => e.message).join(', ');
                            throw new Error(`Linear GraphQL errors: ${errorMessages}`);
                          }
                          
                          return json.data;
                        } catch (error) {
                          core.error(`Error calling Linear API: ${error.message}`);
                          throw error;
                        }
                      }

                      try {
                        // 1) Set team ID
                        const teamId = "19b9c1b2-5f58-498c-b1bf-23ee8f52a677"

                        // 2) Look for existing issue by PR URL
                        const pr = context.payload.pull_request;
                        const searchData = await gql(
                          `query($team:ID!,$q:String!){
                              issues(filter: { team: { id: { eq: $team } } attachments: { some: { url: { eq: $q } } } }){nodes{id,url}}
                            }`,
                          { team: teamId, q: pr.html_url }
                        );
                        let issue = searchData.issues.nodes[0];

                        // 3) Create if missing
                        if (!issue) {
                          const createData = await gql(
                            `mutation($input:IssueCreateInput!){
                                issueCreate(input:$input){issue{id,url}}
                              }`,
                            {
                              input: {
                                teamId,
                                title: `[GITHUB] ${pr.title}`,
                                description: `${pr.body||''}\n\n${pr.html_url}`,
                                stateId: "4d9bcba2-6712-47e3-b577-6ec1ee023dc2",
                                labelIds: ["504e7d60-5037-483f-a9b8-7e298bdf116f"]
                              }
                            }
                          );
                          issue = createData.issueCreate.issue;
                        }

                        // Set output for next steps
                        core.setOutput('linear-issue-url', issue.url);
                        core.setOutput('error', 'false');
                      } catch (error) {
                        core.setOutput('error', 'true');
                        core.setOutput('error-message', error.message);
                        core.setFailed(`Failed to create or find Linear issue: ${error.message}`);
                      }

            - name: Comment PR with Linear link
              if: steps.check-linear.outputs.result == 'false'
              uses: actions/github-script@v6
              with:
                  script: |
                      const pr = context.payload.pull_request;
                      const url = `${{ steps.linear.outputs.linear-issue-url }}`;
                      const body = `🔗 Linear issue created: ${url}`;
                      // Fetch existing comments
                      const { data: comments } = await github.rest.issues.listComments({
                        ...context.repo,
                        issue_number: pr.number
                      });
                      const botComment = comments.find(c =>
                        c.user.type === "Bot" && c.body.startsWith("🔗 Linear issue created:")
                      );
                      if (botComment) {
                        await github.rest.issues.updateComment({
                          ...context.repo,
                          comment_id: botComment.id,
                          body
                        });
                      } else {
                        await github.rest.issues.createComment({
                          ...context.repo,
                          issue_number: pr.number,
                          body
                        });
                      }