import * as fs from "node:fs";
import * as path from "node:path";
import { execSync } from "node:child_process";
import { CIAgentFiles } from "./ciagent-files.js";
import { GitContext } from "./git-context.js";

export type IdeationSource =
  | "uncovered_requirement"
  | "repeated_lesson"
  | "low_confidence_decision"
  | "escalation_pattern"
  | "compound_pattern"
  | "partial_requirement"
  | "gap_in_coverage"
  | "improvement_pattern"
  | "architecture_drift"
  | "verification_inversion"
  | "spec_ambiguity"
  | "spec_contradiction"
  | "spec_missing"
  | "external_signal"
  | "cross_project_lesson"
  | "chaos_scenario";

export type IdeationCategory =
  | "security"
  | "quality"
  | "architecture"
  | "coverage"
  | "improvement"
  | "spec"
  | "chaos";

export type IdeationAction =
  | "add_requirement"
  | "update_architecture"
  | "update_roadmap"
  | "fix_documentation"
  | "add_test"
  | "add_security_pattern"
  | "refactor"
  | "new_milestone_phase";

export type IdeationTier = "mechanical" | "backend-enriched" | "cross-project";

export interface Idea {
  id: string;
  source: IdeationSource;
  category: IdeationCategory;
  title: string;
  rationale: string;
  confidence: number;
  relatedReq?: string;
  actions: IdeationAction[];
  tier: IdeationTier;
}

export interface IdeationResult {
  project: string;
  milestone: string;
  ideas: Idea[];
  summary: IdeationSummary;
}

export interface IdeationSummary {
  total: number;
  accepted: number;
  skipped: number;
  by_category: Record<string, number>;
  by_tier: Record<string, number>;
}

export interface IdeationConfig {
  enabled: boolean;
  categories: IdeationCategory[];
  confidence_threshold: number;
  max_ideas: number;
  external_signals: {
    npm_audit: boolean;
    osv_advisories: boolean;
    dependency_staleness: boolean;
  };
  cross_project: {
    enabled: boolean;
    similarity_weight: number;
  };
  chaos: {
    enabled: boolean;
    scenarios: string[];
  };
}

export const DEFAULT_IDEATION_CONFIG: IdeationConfig = {
  enabled: true,
  categories: ["security", "quality", "architecture", "coverage", "improvement"],
  confidence_threshold: 0.6,
  max_ideas: 20,
  external_signals: {
    npm_audit: true,
    osv_advisories: true,
    dependency_staleness: true,
  },
  cross_project: {
    enabled: false,
    similarity_weight: 0.5,
  },
  chaos: {
    enabled: true,
    scenarios: ["backend_unavailable", "requirement_change", "test_coverage_drop"],
  },
};

let ideaCounter = 0;

function nextIdeaId(): string {
  ideaCounter++;
  return `IDEATE-${String(ideaCounter).padStart(2, "0")}`;
}

export function resetIdeaCounter(): void {
  ideaCounter = 0;
}

export class IdeationEngine {
  private ciFiles: CIAgentFiles;
  private projectPath: string;

  constructor(projectPath: string, projectSlug?: string) {
    this.projectPath = projectPath;
    this.ciFiles = new CIAgentFiles(projectPath);
    if (projectSlug) {
      this.ciFiles.setProjectSlug(projectSlug);
    }
  }

  runMechanical(categories?: IdeationCategory[]): Idea[] {
    resetIdeaCounter();
    const ideas: Idea[] = [];
    const filterCategories = categories || DEFAULT_IDEATION_CONFIG.categories;

    const shouldCategory = (cat: IdeationCategory): boolean =>
      filterCategories.length === 0 || filterCategories.includes(cat);

    if (shouldCategory("coverage")) {
      ideas.push(...this.mineUncoveredRequirements());
      ideas.push(...this.minePartialRequirements());
      ideas.push(...this.mineCoverageGaps());
    }

    if (shouldCategory("quality") || shouldCategory("improvement")) {
      ideas.push(...this.mineRepeatedLessons());
      ideas.push(...this.mineLowConfidenceDecisions());
      ideas.push(...this.mineCompoundPatterns());
    }

    if (shouldCategory("architecture")) {
      ideas.push(...this.mineArchitectureDrift());
    }

    if (shouldCategory("security")) {
      ideas.push(...this.mineEscalationPatterns());
    }

    if (shouldCategory("improvement")) {
      ideas.push(...this.mineImprovementPatterns());
    }

    if (shouldCategory("spec")) {
      ideas.push(...this.mineSpecAmbiguity());
      ideas.push(...this.mineSpecContradictions());
      ideas.push(...this.mineSpecMissing());
    }

    if (shouldCategory("quality")) {
      ideas.push(...this.mineVerificationInversion());
    }

    ideas.sort((a, b) => b.confidence - a.confidence);

    return ideas.slice(0, DEFAULT_IDEATION_CONFIG.max_ideas);
  }

  private mineUncoveredRequirements(): Idea[] {
    const ideas: Idea[] = [];
    const reqs = this.ciFiles.readRequirementsMd();
    if (!reqs) return ideas;

    const coveredReqs = new Set<string>();
    for (const t of reqs.traceability) {
      if (t.status === "complete") {
        coveredReqs.add(t.requirement);
      }
    }

    const allReqIds = new Set<string>();
    for (const cat of [...reqs.v1, ...reqs.v2]) {
      for (const item of cat.items) {
        allReqIds.add(item.id);
      }
    }

    for (const reqId of allReqIds) {
      if (!coveredReqs.has(reqId)) {
        ideas.push({
          id: nextIdeaId(),
          source: "uncovered_requirement",
          category: "coverage",
          title: `Address uncovered requirement: ${reqId}`,
          rationale: `Requirement ${reqId} exists in REQUIREMENTS.md but has no completed implementation traceability record.`,
          confidence: 0.85,
          relatedReq: reqId,
          actions: ["add_requirement", "update_roadmap"],
          tier: "mechanical",
        });
      }
    }

    return ideas;
  }

  private minePartialRequirements(): Idea[] {
    const ideas: Idea[] = [];
    const reqs = this.ciFiles.readRequirementsMd();
    if (!reqs) return ideas;

    for (const t of reqs.traceability) {
      if (t.status === "in_progress") {
        ideas.push({
          id: nextIdeaId(),
          source: "partial_requirement",
          category: "coverage",
          title: `Complete in-progress requirement: ${t.requirement}`,
          rationale: `Requirement ${t.requirement} (Phase ${t.phase}) is in progress but not complete. In-progress items may be blocked or abandoned.`,
          confidence: 0.75,
          relatedReq: t.requirement,
          actions: ["add_requirement"],
          tier: "mechanical",
        });
      }
    }

    return ideas;
  }

  private mineCoverageGaps(): Idea[] {
    const ideas: Idea[] = [];
    const projectMd = this.ciFiles.readProjectMd();
    if (!projectMd) return ideas;

    const mentionedAgents: string[] = [];
    const agentRegex = /(?:agent|Agent)[:\s]+(\S+)/g;
    let match;
    while ((match = agentRegex.exec(projectMd.coreValue || "")) !== null) {
      mentionedAgents.push(match[1]);
    }

    const agentsDir = path.join(this.projectPath, "src", "agents");
    if (!fs.existsSync(agentsDir)) return ideas;

    const existingAgents = new Set(
      fs.readdirSync(agentsDir)
        .filter((f) => f.endsWith(".ts") && !f.endsWith(".test.ts") && !f.endsWith(".d.ts") && f !== "index.ts" && f !== "base.ts")
        .map((f) => f.replace(".ts", ""))
    );

    for (const agent of mentionedAgents) {
      if (!existingAgents.has(agent) && !existingAgents.has(agent.replace(/-agent$/, ""))) {
        ideas.push({
          id: nextIdeaId(),
          source: "gap_in_coverage",
          category: "coverage",
          title: `Fill coverage gap: ${agent}`,
          rationale: `Agent "${agent}" is mentioned in PROJECT.md but not found in the agent registry.`,
          confidence: 0.75,
          actions: ["add_requirement"],
          tier: "mechanical",
        });
      }
    }

    return ideas;
  }

  private mineRepeatedLessons(): Idea[] {
    const ideas: Idea[] = [];
    const lessons = this.readGitLessons();
    const topicCounts: Record<string, number> = {};
    const topicDetails: Record<string, string[]> = {};

    for (const lesson of lessons) {
      const topic = lesson.topic;
      topicCounts[topic] = (topicCounts[topic] || 0) + 1;
      if (!topicDetails[topic]) topicDetails[topic] = [];
      topicDetails[topic].push(lesson.detail);
    }

    for (const [topic, count] of Object.entries(topicCounts)) {
      if (count > 1) {
        ideas.push({
          id: nextIdeaId(),
          source: "repeated_lesson",
          category: "improvement",
          title: `Investigate repeated lesson: ${topic}`,
          rationale: `Topic "${topic}" appears ${count} times in commit lessons (${topicDetails[topic].slice(0, 2).join("; ")}), indicating a systemic issue.`,
          confidence: Math.min(0.7 + count * 0.05, 0.95),
          actions: ["add_requirement", "refactor"],
          tier: "mechanical",
        });
      }
    }

    return ideas;
  }

  private mineLowConfidenceDecisions(): Idea[] {
    const ideas: Idea[] = [];
    try {
      const log = execSync(
        'git log --all --grep="decisions:" --format="%B" -50',
        { cwd: this.projectPath, encoding: "utf-8", timeout: 5000 }
      );

      const decisionRegex = /confidence:\s*([\d.]+)/gi;
      let match;
      while ((match = decisionRegex.exec(log)) !== null) {
        const confidence = parseFloat(match[1]);
        if (confidence < 0.7 && confidence > 0) {
          const contextStart = Math.max(0, match.index - 200);
          const context = log.slice(contextStart, match.index + 100);
          const idMatch = context.match(/id:\s*(D-\d+)/i);
          ideas.push({
            id: nextIdeaId(),
            source: "low_confidence_decision",
            category: "improvement",
            title: `Revisit low-confidence decision${idMatch ? ` ${idMatch[1]}` : ""}`,
            rationale: `A decision was made with confidence ${confidence.toFixed(2)} (below 0.7 threshold). Low-confidence decisions are prime candidates for re-evaluation.`,
            confidence: 0.8,
            actions: ["update_roadmap"],
            tier: "mechanical",
          });
        }
      }
    } catch {}

    return ideas;
  }

  private mineEscalationPatterns(): Idea[] {
    const ideas: Idea[] = [];
    try {
      const log = execSync(
        'git log --all --grep="escalation:" --format="%B" -50',
        { cwd: this.projectPath, encoding: "utf-8", timeout: 5000 }
      );

      const typeCounts: Record<string, number> = {};
      const escalationRegex = /type:\s*(\S+)/gi;
      let match;
      while ((match = escalationRegex.exec(log)) !== null) {
        const type = match[1].toLowerCase();
        typeCounts[type] = (typeCounts[type] || 0) + 1;
      }

      for (const [type, count] of Object.entries(typeCounts)) {
        if (count >= 1) {
          ideas.push({
            id: nextIdeaId(),
            source: "escalation_pattern",
            category: "security",
            title: `Address escalation pattern: ${type}`,
            rationale: `Escalation type "${type}" occurred ${count} time(s). Recurring escalation types indicate process gaps that should be addressed.`,
            confidence: 0.7 + Math.min(count * 0.1, 0.2),
            actions: ["add_security_pattern", "update_roadmap"],
            tier: "mechanical",
          });
        }
      }
    } catch {}

    return ideas;
  }

  private mineCompoundPatterns(): Idea[] {
    const ideas: Idea[] = [];
    try {
      const log = execSync(
        'git log --all --grep="compound:" --format="%B" -50',
        { cwd: this.projectPath, encoding: "utf-8", timeout: 5000 }
      );

      const compoundRegex = /compound:\s*\n((?:\s+-\s+.+\n?)+)/g;
      const topicCounts: Record<string, number> = {};
      let match;
      while ((match = compoundRegex.exec(log)) !== null) {
        const items = match[1].split("\n").filter((l: string) => l.trim().startsWith("-"));
        for (const item of items) {
          const detail = item.replace(/^\s*-\s*/, "").trim();
          const topic = detail.split(":")[0].trim().toLowerCase();
          topicCounts[topic] = (topicCounts[topic] || 0) + 1;
        }
      }

      for (const [topic, count] of Object.entries(topicCounts)) {
        if (count > 1) {
          ideas.push({
            id: nextIdeaId(),
            source: "compound_pattern",
            category: "improvement",
            title: `Generalize compounded solution: ${topic}`,
            rationale: `Solution pattern "${topic}" was compounded ${count} times. Consider generalizing this into a shared utility or documented approach.`,
            confidence: 0.75,
            actions: ["refactor", "update_architecture"],
            tier: "mechanical",
          });
        }
      }
    } catch {}

    return ideas;
  }

  private mineArchitectureDrift(): Idea[] {
    const ideas: Idea[] = [];
    const archMd = this.ciFiles.readArchitectureMd();
    if (!archMd) return ideas;

    for (const component of archMd.components) {
      const expectedDir = component.name.toLowerCase().replace(/\s+/g, "-");
      const possiblePaths = [
        path.join(this.projectPath, "src", expectedDir),
        path.join(this.projectPath, "src", component.name),
        path.join(this.projectPath, component.name.toLowerCase()),
      ];

      const dirExists = possiblePaths.some((p) => fs.existsSync(p));
      if (!dirExists) {
        ideas.push({
          id: nextIdeaId(),
          source: "architecture_drift",
          category: "architecture",
          title: `Documented component not found: ${component.name}`,
          rationale: `ARCHITECTURE.md documents component "${component.name}" but no corresponding directory exists in src/. Either the component is missing or the documentation is stale.`,
          confidence: 0.7,
          actions: ["update_architecture", "fix_documentation"],
          tier: "mechanical",
        });
      }
    }

    const srcDir = path.join(this.projectPath, "src");
    if (fs.existsSync(srcDir)) {
      const knownComponents = new Set(archMd.components.map((c) => c.name.toLowerCase().replace(/\s+/g, "-")));

      try {
        const srcEntries = fs.readdirSync(srcDir, { withFileTypes: true })
          .filter((d) => d.isDirectory())
          .map((d) => d.name.toLowerCase());

        for (const entry of srcEntries) {
          if (!knownComponents.has(entry) && !entry.startsWith(".") && entry !== "types" && entry !== "utils") {
            ideas.push({
              id: nextIdeaId(),
              source: "architecture_drift",
              category: "architecture",
              title: `Undocumented source directory: src/${entry}`,
              rationale: `Directory src/${entry}/ exists but is not documented in ARCHITECTURE.md. This indicates architectural drift.`,
              confidence: 0.65,
              actions: ["update_architecture"],
              tier: "mechanical",
            });
          }
        }
      } catch {}
    }

    return ideas;
  }

  private mineVerificationInversion(): Idea[] {
    const ideas: Idea[] = [];

    const srcDir = path.join(this.projectPath, "src");
    if (!fs.existsSync(srcDir)) return ideas;

    const testFiles: string[] = [];
    const srcFiles: string[] = [];

    try {
      const walkDir = (dir: string) => {
        const entries = fs.readdirSync(dir, { withFileTypes: true });
        for (const entry of entries) {
          const fullPath = path.join(dir, entry.name);
          if (entry.isDirectory() && !entry.name.startsWith(".") && entry.name !== "node_modules") {
            walkDir(fullPath);
          } else if (entry.isFile() && entry.name.endsWith(".ts")) {
            if (entry.name.endsWith(".test.ts")) {
              testFiles.push(entry.name.replace(".test.ts", ""));
            } else if (!entry.name.endsWith(".d.ts") && !entry.name.includes(".test.")) {
              srcFiles.push(entry.name.replace(".ts", ""));
            }
          }
        }
      };
      walkDir(srcDir);
    } catch {}

    const testedModules = new Set(testFiles);
    for (const srcModule of srcFiles) {
      if (!testedModules.has(srcModule) && srcModule !== "index" && srcModule !== "base") {
        ideas.push({
          id: nextIdeaId(),
          source: "verification_inversion",
          category: "quality",
          title: `Missing tests for: ${srcModule}`,
          rationale: `Source file ${srcModule}.ts has no corresponding test file ${srcModule}.test.ts. The behavioral verification layer identifies this as a coverage gap.`,
          confidence: 0.7,
          actions: ["add_test"],
          tier: "mechanical",
        });
      }
    }

    return ideas.slice(0, 10);
  }

  private mineImprovementPatterns(): Idea[] {
    const ideas: Idea[] = [];
    const reqs = this.ciFiles.readRequirementsMd();
    const lessons = this.readGitLessons();

    if (!reqs) return ideas;

    const uncoveredSet = new Set<string>();
    for (const t of reqs.traceability) {
      if (t.status === "pending") {
        uncoveredSet.add(t.requirement);
      }
    }

    const topics = lessons.map((l) => l.topic.toLowerCase());

    for (const reqId of uncoveredSet) {
      for (const topic of topics) {
        if (reqId.toLowerCase().includes(topic) || topic.includes(reqId.toLowerCase())) {
          ideas.push({
            id: nextIdeaId(),
            source: "improvement_pattern",
            category: "improvement",
            title: `Cross-reference: ${reqId} ↔ ${topic}`,
            rationale: `Repeated lesson "${topic}" directly relates to uncovered requirement ${reqId}. Addressing the lesson may resolve the requirement.`,
            confidence: 0.85,
            relatedReq: reqId,
            actions: ["add_requirement", "update_roadmap"],
            tier: "mechanical",
          });
        }
      }
    }

    return ideas;
  }

  private mineSpecAmbiguity(): Idea[] {
    const ideas: Idea[] = [];
    const projectMd = this.ciFiles.readProjectMd();
    if (!projectMd) return ideas;

    const ambiguousTerms = ["should", "could", "might", "may", "would", "possibly", "perhaps"];
    const specText = [projectMd.coreValue, ...projectMd.requirements.active].join(" ");

    for (const term of ambiguousTerms) {
      const regex = new RegExp(`\\b${term}\\b`, "gi");
      const matches = specText.match(regex);
      if (matches && matches.length > 2) {
        ideas.push({
          id: nextIdeaId(),
          source: "spec_ambiguity",
          category: "spec",
          title: `Ambiguous language in specification: "${term}" (${matches.length} occurrences)`,
          rationale: `The term "${term}" appears ${matches.length} times in project specification. Consider replacing with "must" or "shall" for clarity, or marking as optional.`,
          confidence: 0.65,
          actions: ["fix_documentation"],
          tier: "mechanical",
        });
      }
    }

    return ideas;
  }

  private mineSpecContradictions(): Idea[] {
    return [];
  }

  private mineSpecMissing(): Idea[] {
    const ideas: Idea[] = [];
    const projectMd = this.ciFiles.readProjectMd();
    if (!projectMd) return ideas;

    const specText = (projectMd.coreValue + " " + projectMd.requirements.active.join(" ")).toLowerCase();

    const commonCategories: Array<{ keyword: string; title: string; category: IdeationCategory }> = [
      { keyword: "auth", title: "Add authentication and authorization requirements", category: "security" },
      { keyword: "rate", title: "Add rate limiting requirements", category: "security" },
      { keyword: "log", title: "Add logging and observability requirements", category: "quality" },
      { keyword: "error", title: "Add error handling and recovery requirements", category: "quality" },
      { keyword: "test", title: "Add testing strategy requirements", category: "coverage" },
      { keyword: "doc", title: "Add documentation requirements", category: "improvement" },
      { keyword: "config", title: "Add configuration management requirements", category: "architecture" },
    ];

    for (const cat of commonCategories) {
      if (!specText.includes(cat.keyword)) {
        ideas.push({
          id: nextIdeaId(),
          source: "spec_missing",
          category: cat.category,
          title: cat.title,
          rationale: `No mention of "${cat.keyword}" in the project specification. This is a common requirement category that may be missing.`,
          confidence: 0.55,
          actions: ["add_requirement"],
          tier: "mechanical",
        });
      }
    }

    return ideas;
  }

  private readGitLessons(): Array<{ topic: string; detail: string }> {
    const lessons: Array<{ topic: string; detail: string }> = [];
    try {
      const log = execSync('git log --all --grep="lessons:" --format="%B" -50', {
        cwd: this.projectPath,
        encoding: "utf-8",
        timeout: 5000,
      });
      const lessonsRegex = /lessons:\s*\n((?:\s+-\s+.+\n?)+)/g;
      let match;
      while ((match = lessonsRegex.exec(log)) !== null) {
        const items = match[1].split("\n").filter((l: string) => l.trim().startsWith("-"));
        for (const item of items) {
          const detail = item.replace(/^\s*-\s*/, "").trim();
          const topic = detail.split(":")[0].trim().toLowerCase();
          lessons.push({ topic, detail });
        }
      }
    } catch {}

    return lessons;
  }

  runAffected(): Idea[] {
    resetIdeaCounter();
    const ideas: Idea[] = [];

    try {
      const diff = execSync("git diff --name-only HEAD", {
        cwd: this.projectPath,
        encoding: "utf-8",
        timeout: 5000,
      });

      const changedFiles = diff.trim().split("\n").filter(Boolean);
      if (changedFiles.length === 0) return ideas;

      const archMd = this.ciFiles.readArchitectureMd();
      if (!archMd) return ideas;

      for (const changedFile of changedFiles) {
        const parts = changedFile.split("/").filter(Boolean);
        const srcIdx = parts.indexOf("src");
        if (srcIdx >= 0 && parts.length > srcIdx + 1) {
          const component = parts[srcIdx + 1];
          const matchingComponent = archMd.components.find(
            (c) => c.name.toLowerCase().replace(/\s+/g, "-") === component.toLowerCase()
          );

          if (matchingComponent) {
            for (const dep of matchingComponent.dependsOn) {
              ideas.push({
                id: nextIdeaId(),
                source: "gap_in_coverage",
                category: "architecture",
                title: `Cascade impact: ${changedFile} may affect ${dep}`,
                rationale: `Component "${matchingComponent.name}" (which depends on "${dep}") was modified. Verify that "${dep}" still works correctly.`,
                confidence: 0.7,
                actions: ["add_test"],
                tier: "mechanical",
              });
            }
          }
        }
      }
    } catch {}

    return ideas;
  }

  runExternal(): Idea[] {
    resetIdeaCounter();
    const ideas: Idea[] = [];

    try {
      const auditResult = execSync("npm audit --json 2>/dev/null || echo '{}'", {
        cwd: this.projectPath,
        encoding: "utf-8",
        timeout: 30000,
      });

      const audit = JSON.parse(auditResult);
      const vulnerabilities = audit.vulnerabilities || {};

      for (const [pkg, info] of Object.entries(vulnerabilities as Record<string, { severity?: string; title?: string }>)) {
        const severity = info.severity || "unknown";
        if (severity === "high" || severity === "critical") {
          ideas.push({
            id: nextIdeaId(),
            source: "external_signal",
            category: "security",
            title: `${severity.toUpperCase()} vulnerability in ${pkg}`,
            rationale: `npm audit reports a ${severity} severity vulnerability in "${pkg}". This should be addressed immediately.`,
            confidence: 0.95,
            actions: ["add_security_pattern", "update_roadmap"],
            tier: "mechanical",
          });
        } else if (severity === "moderate") {
          ideas.push({
            id: nextIdeaId(),
            source: "external_signal",
            category: "security",
            title: `Moderate vulnerability in ${pkg}`,
            rationale: `npm audit reports a moderate severity vulnerability in "${pkg}". Consider upgrading this dependency.`,
            confidence: 0.8,
            actions: ["add_security_pattern"],
            tier: "mechanical",
          });
        }
      }
    } catch {}

    try {
      const result = execSync("npm outdated --json 2>/dev/null || echo '{}'", {
        cwd: this.projectPath,
        encoding: "utf-8",
        timeout: 15000,
      });

      const outdated = JSON.parse(result);
      let staleCount = 0;
      for (const pkg of Object.keys(outdated)) {
        staleCount++;
      }

      if (staleCount > 5) {
        ideas.push({
          id: nextIdeaId(),
          source: "external_signal",
          category: "quality",
          title: `${staleCount} outdated dependencies`,
          rationale: `${staleCount} packages are outdated. Consider scheduling a dependency upgrade task.`,
          confidence: 0.6,
          actions: ["update_roadmap"],
          tier: "mechanical",
        });
      }
    } catch {}

    return ideas;
  }

  runCrossProject(): Idea[] {
    resetIdeaCounter();
    const ideas: Idea[] = [];

    const projects = this.ciFiles.listProjects();
    if (projects.length <= 1) return ideas;

    const currentSlug = this.ciFiles.getProjectSlug() || projects[0].slug;

    for (const project of projects) {
      if (project.slug === currentSlug) continue;

      const projectDir = path.join(this.projectPath, ".ciagent", project.slug);
      if (!fs.existsSync(projectDir)) continue;

      try {
        const log = execSync(
          `git log --all --grep="lessons:" --format="%B" -20`,
          { cwd: this.projectPath, encoding: "utf-8", timeout: 5000 }
        );

        const lessonsRegex = /lessons:\s*\n((?:\s+-\s+.+\n?)+)/g;
        let match;
        while ((match = lessonsRegex.exec(log)) !== null) {
          const items = match[1].split("\n").filter((l: string) => l.trim().startsWith("-"));
          for (const item of items) {
            const detail = item.replace(/^\s*-\s*/, "").trim();
            const topic = detail.split(":")[0].trim();
            ideas.push({
              id: nextIdeaId(),
              source: "cross_project_lesson",
              category: "improvement",
              title: `Cross-project lesson from ${project.slug}: ${topic}`,
              rationale: `Project "${project.slug}" learned: "${detail}". Consider whether this applies to the current project.`,
              confidence: 0.6,
              actions: ["add_requirement"],
              tier: "cross-project",
            });
          }
        }
      } catch {}
    }

    return ideas;
  }

  formatIdeas(ideas: Idea[]): string {
    if (ideas.length === 0) return "No improvement ideas identified for this project.";

    const lines: string[] = ["Improvement Ideas:", ""];
    for (const idea of ideas) {
      lines.push(`[${idea.source}|${idea.confidence.toFixed(2)}] ${idea.title} — ${idea.rationale}${idea.relatedReq ? ` (req: ${idea.relatedReq})` : ""}`);
    }
    return lines.join("\n");
  }

  formatIdeasJson(ideas: Idea[]): IdeationResult {
    const byCategory: Record<string, number> = {};
    const byTier: Record<string, number> = {};
    for (const idea of ideas) {
      byCategory[idea.category] = (byCategory[idea.category] || 0) + 1;
      byTier[idea.tier] = (byTier[idea.tier] || 0) + 1;
    }

    return {
      project: this.ciFiles.getProjectSlug() || "default",
      milestone: "",
      ideas,
      summary: {
        total: ideas.length,
        accepted: 0,
        skipped: 0,
        by_category: byCategory,
        by_tier: byTier,
      },
    };
  }

  acceptIdea(idea: Idea): { reqId: string; addedToRequirements: boolean; addedToRoadmap: boolean } {
    const reqId = idea.id;
    const reqs = this.ciFiles.readRequirementsMd();
    const roadmap = this.ciFiles.readRoadmapMd();

    let addedToRequirements = false;
    let addedToRoadmap = false;

    if (reqs) {
      const categoryMap: Record<string, string> = {
        security: "Security",
        quality: "Quality",
        architecture: "Architecture",
        coverage: "Coverage",
        improvement: "Improvement",
        spec: "Specification",
        chaos: "Resilience",
      };

      const categoryName = categoryMap[idea.category] || "Improvement";
      let foundCategory = false;
      for (const cat of reqs.v1) {
        if (cat.category.toLowerCase() === categoryName.toLowerCase()) {
          cat.items.push({ id: reqId, description: idea.title });
          foundCategory = true;
          break;
        }
      }
      if (!foundCategory) {
        reqs.v1.push({
          category: categoryName,
          items: [{ id: reqId, description: idea.title }],
        });
      }

      reqs.traceability.push({
        requirement: reqId,
        phase: 0,
        status: "pending",
      });

      this.ciFiles.writeRequirementsMd(reqs);
      addedToRequirements = true;
    }

    if (roadmap) {
      const lastPhase = roadmap.phases.length > 0
        ? roadmap.phases[roadmap.phases.length - 1]
        : null;

      const nextPhaseNumber = lastPhase ? lastPhase.number + 1 : 1;
      const phaseName = idea.category === "security" ? "security-hardening"
        : idea.category === "architecture" ? "architecture-fix"
        : idea.category === "coverage" ? "coverage-expansion"
        : idea.category === "quality" ? "quality-improvement"
        : idea.category === "spec" ? "spec-refinement"
        : idea.category === "chaos" ? "resilience-hardening"
        : "improvement";

      roadmap.phases.push({
        number: nextPhaseNumber,
        name: phaseName,
        description: idea.title,
        status: "not_started",
        dependsOn: lastPhase ? [lastPhase.number] : [],
        requirements: [reqId],
        successCriteria: [idea.rationale],
      });

      this.ciFiles.writeRoadmapMd(roadmap);
      addedToRoadmap = true;
    }

    return { reqId, addedToRequirements, addedToRoadmap };
  }

  acceptIdeas(ideas: Idea[]): { accepted: Idea[]; results: Array<{ reqId: string; addedToRequirements: boolean; addedToRoadmap: boolean }> } {
    const accepted: Idea[] = [];
    const results: Array<{ reqId: string; addedToRequirements: boolean; addedToRoadmap: boolean }> = [];

    for (const idea of ideas) {
      const result = this.acceptIdea(idea);
      if (result.addedToRequirements || result.addedToRoadmap) {
        accepted.push(idea);
        results.push(result);
      }
    }

    return { accepted, results };
  }
}