import { BaseAgent, AgentContext, AgentResult } from "./base.js";
import { DecisionEngine } from "../core/decision-engine.js";
import { ClarifyPhase } from "../core/clarify.js";
import { EscalationProtocol, EscalationInput } from "../core/escalation.js";
import { GitContext, ProjectState } from "../core/git-context.js";
import { GitBranch } from "../core/git-branch.js";
import { CIAgentFiles } from "../core/ciagent-files.js";
import { CommitBuilder } from "../core/commit-builder.js";
import { CIAgentConfig, AgentName } from "../types/config.js";
import {
  PipelineState,
  PipelineStage,
  PhaseResult,
  OrchestratorResult,
  createInitialPipelineState,
  STAGE_ORDER,
} from "../types/pipeline.js";
import { Specification, parseSpecification } from "../types/specification.js";
import { loadConfig, saveConfig, isCIAgentInitialized, initCIAgent } from "../core/config.js";
import { getAgent } from "./index.js";
import { IntelligenceBackend, BackendUnavailableError } from "../backends/types.js";
import { registerEscalationProtocol } from "../cli/index.js";
import { execSync } from "node:child_process";

export interface GitAgentContext extends AgentContext {
  gitContext: GitContext;
  gitBranch: GitBranch;
  ciFiles: CIAgentFiles;
  milestone: string;
}

export class OrchestratorAgent extends BaseAgent {
  readonly name: AgentName = "orchestrator";
  readonly description = "Top-level autonomous controller that coordinates the full CIAgent pipeline";
  readonly workflow = "run";

  private config: CIAgentConfig;
  private pipelineState: PipelineState | null = null;
  private decisionEngine: DecisionEngine | null = null;
  private escalationProtocol: EscalationProtocol | null = null;
  private gitContext: GitContext | null = null;
  private gitBranch: GitBranch | null = null;
  private ciFiles: CIAgentFiles | null = null;
  private currentMilestone: string;
  private phaseResults: PhaseResult[] = [];
  private totalPhases: number = 1;

  private static readonly STAGE_AGENT_MAP: Partial<Record<PipelineStage, AgentName[]>> = {
    research: ["researcher"],
    plan: ["planner"],
    execute: ["executor", "code-reviewer", "security-auditor"],
    test: ["tester"],
    verify: ["verifier"],
    complete: ["doc-writer"],
  };

  constructor(config?: CIAgentConfig) {
    super();
    this.config = config || loadConfig(process.cwd());
    this.currentMilestone = "v1.0";
  }

  async execute(context: AgentContext): Promise<AgentResult> {
    const startTime = Date.now();
    this.log("Starting CIAgent Orchestrator pipeline (git-native)");

    try {
      this.config = loadConfig(context.project_path);

      this.gitContext = new GitContext(context.project_path);
      this.gitBranch = new GitBranch(context.project_path);
      this.ciFiles = new CIAgentFiles(context.project_path);
      this.ciFiles.ensureCIDir();

      const projectState = this.gitContext.reconstructState();
      this.currentMilestone = projectState.currentMilestone || "v1.0";

      this.log(`Reconstructed state: phase=${projectState.currentPhase}, milestone=${projectState.currentMilestone}, stage=${projectState.currentStage}`);

      this.pipelineState = createInitialPipelineState(context.project_path);
      if (projectState.currentPhase > 0) {
        this.pipelineState.current_phase = projectState.currentPhase;
        this.pipelineState.current_stage = projectState.currentStage;
      }

      this.totalPhases = this.deriveTotalPhases();
      this.log(`Total phases in milestone: ${this.totalPhases}`);

      this.decisionEngine = new DecisionEngine(this.config, context.project_path, this.currentMilestone);
      this.escalationProtocol = new EscalationProtocol(this.config, context.project_path, this.currentMilestone);
      registerEscalationProtocol(this.escalationProtocol);

      while (this.pipelineState.current_phase <= this.totalPhases) {
        this.log(`Processing phase ${this.pipelineState.current_phase} of ${this.totalPhases}`);

        for (const stage of STAGE_ORDER) {
          this.log(`Entering stage: ${stage}`);
          this.pipelineState.current_stage = stage;
          this.pipelineState.last_updated = new Date().toISOString();

          const result = await this.executeStageWithRecovery(stage, context);

          this.phaseResults.push(result);
          this.recordPhaseResult(result);

          if (!result.success && stage !== "complete") {
            this.pipelineState.errors.push({
              stage,
              phase: this.pipelineState.current_phase,
              message: result.error || "Stage failed",
              timestamp: new Date().toISOString(),
              retry_count: 0,
              resolved: false,
            });

            if (stage === "specify" || stage === "clarify") {
              return {
                success: false,
                output: `Pipeline failed at ${stage}: ${result.error}`,
                artifacts_created: this.phaseResults.reduce(
                  (acc, r) => acc + r.artifacts_created.length,
                  0
                ),
                decisions: this.phaseResults.reduce(
                  (acc, r) => acc + r.decisions_made,
                  0
                ),
                escalations: this.phaseResults.reduce(
                  (acc, r) => acc + r.escalations_raised,
                  0
                ),
                duration_ms: Date.now() - startTime,
                error: result.error,
              };
            }
          }
        }

        if (this.pipelineState.current_phase < this.totalPhases) {
          this.performPhaseBoundaryCheckpoint(context);
          this.pipelineState.current_phase++;
          this.pipelineState.current_stage = "specify";
          this.log(`Advancing to phase ${this.pipelineState.current_phase}`);
        } else {
          break;
        }
      }

      const totalDuration = Date.now() - startTime;
      const completionReport = this.generateCompletionReport();

      return {
        success: true,
        output: completionReport,
        artifacts_created: this.phaseResults.reduce(
          (acc, r) => acc + r.artifacts_created.length,
          0
        ),
        decisions: this.phaseResults.reduce(
          (acc, r) => acc + r.decisions_made,
          0
        ),
        escalations: this.phaseResults.reduce(
          (acc, r) => acc + r.escalations_raised,
          0
        ),
        duration_ms: totalDuration,
      };
    } catch (err) {
      return {
        success: false,
        output: `Orchestrator failed: ${err instanceof Error ? err.message : String(err)}`,
        artifacts_created: 0,
        decisions: 0,
        escalations: 0,
        duration_ms: Date.now() - startTime,
        error: err instanceof Error ? err.message : String(err),
      };
    } finally {
      this.escalationProtocol?.dispose();
    }
  }

  private buildGitAgentContext(context: AgentContext): GitAgentContext {
    return {
      ...context,
      gitContext: this.gitContext!,
      gitBranch: this.gitBranch!,
      ciFiles: this.ciFiles!,
      milestone: this.currentMilestone,
    };
  }

  private recordPhaseResult(result: PhaseResult): void {
    for (const artifact of result.artifacts_created) {
      this.log(`Artifact created: ${artifact}`);
    }

    if (result.decisions_made > 0 && this.decisionEngine) {
      this.decisionEngine.makeHighConfidenceDecision(
        `Agent reported ${result.decisions_made} decision(s) during ${result.stage}`,
        `Decisions recorded from ${result.stage} stage execution`,
        "general",
        []
      );
    }

    if (result.escalations_raised > 0 && this.escalationProtocol) {
      this.escalationProtocol.escalate({
        type: "low_confidence_decision",
        phase: String(this.pipelineState!.current_phase),
        description: `Agent reported ${result.escalations_raised} escalation(s) during ${result.stage}`,
        context: `Stage ${result.stage} raised escalations during execution`,
        options: [
          { id: "proceed", label: "Proceed", description: "Continue pipeline execution", recommended: true },
          { id: "halt", label: "Halt", description: "Stop pipeline and await manual review", recommended: false },
        ],
        default_option_id: "proceed",
      });
    }
  }

  private deriveTotalPhases(): number {
    if (!this.ciFiles) return 1;
    const roadmap = this.ciFiles.readRoadmapMd();
    if (!roadmap || roadmap.phases.length === 0) return 1;
    return roadmap.phases.length;
  }

  private performPhaseBoundaryCheckpoint(context: AgentContext): void {
    this.log(`Phase boundary checkpoint for phase ${this.pipelineState!.current_phase}`);

    if (this.config.git.auto_commit && this.gitContext!.isGitRepo()) {
      try {
        const message = `chore(P${String(this.pipelineState!.current_phase).padStart(2, "0")}): phase boundary checkpoint\n\n---ci---\nphase: ${this.pipelineState!.current_phase}\nmilestone: ${this.currentMilestone}\nstatus: complete\n---/ci---`;
        execSync(`git add -A && git commit -m "${message.replace(/"/g, '\\"')}" --allow-empty`, {
          cwd: context.project_path,
          stdio: "pipe",
        });
      } catch (err) {
        this.warn(`Phase boundary commit failed: ${err instanceof Error ? err.message : String(err)}`);
      }
    }

    if (this.ciFiles) {
      this.ciFiles.updatePhaseStatus(this.pipelineState!.current_phase, "complete");

      const reqs = this.ciFiles.readRequirementsMd();
      if (reqs) {
        for (const t of reqs.traceability) {
          if (t.phase === this.pipelineState!.current_phase && t.status === "in_progress") {
            this.ciFiles.updateRequirementStatus(t.requirement, "complete");
          }
        }
      }
    }

    if (this.gitContext) {
      const verifiedState = this.gitContext.reconstructState();
      this.log(`Verified state: phase=${verifiedState.currentPhase}, milestone=${verifiedState.currentMilestone}, stage=${verifiedState.currentStage}`);
    }
  }

  private async executeStageWithRecovery(
    stage: PipelineStage,
    context: AgentContext
  ): Promise<PhaseResult> {
    try {
      const result = await this.executeStage(stage, context);
      if (result.success) return result;
    } catch (err) {
      this.warn(`First attempt failed for ${stage}: ${err instanceof Error ? err.message : String(err)}`);
    }

    this.log(`Retrying stage ${stage}...`);
    try {
      const result = await this.executeStage(stage, context);
      if (result.success) return result;
    } catch (err) {
      this.warn(`Retry failed for ${stage}: ${err instanceof Error ? err.message : String(err)}`);
    }

    if (context.backend) {
      this.log(`Attempting plan revision for failed stage ${stage}...`);
      try {
        const planner = getAgent("planner");
        const gitContext = this.buildGitAgentContext(context);
        const planResult = await planner.execute({
          ...gitContext,
          specification: `Plan revision needed: stage ${stage} failed twice. Original error context: phase ${this.pipelineState!.current_phase}`,
        });
        if (planResult.success) {
          this.log(`Plan revision succeeded, retrying ${stage} with revised plan...`);
          try {
            const result = await this.executeStage(stage, context);
            if (result.success) return result;
          } catch (err) {
            this.warn(`Post-revision retry failed for ${stage}: ${err instanceof Error ? err.message : String(err)}`);
          }
        }
      } catch (err) {
        this.warn(`Plan revision failed: ${err instanceof Error ? err.message : String(err)}`);
      }
    }

    if (this.escalationProtocol) {
      this.escalationProtocol.escalate({
        type: "verification_failure",
        phase: String(this.pipelineState!.current_phase),
        description: `Stage ${stage} failed after retry and plan revision attempts`,
        context: `All recovery attempts exhausted for stage ${stage} in phase ${this.pipelineState!.current_phase}`,
        options: [
          { id: "skip", label: "Skip stage", description: "Continue pipeline skipping this stage", recommended: true },
          { id: "abort", label: "Abort pipeline", description: "Stop the entire pipeline", recommended: false },
        ],
        default_option_id: "skip",
      });
    }

    return {
      phase: this.pipelineState!.current_phase,
      stage,
      success: false,
      artifacts_created: [],
      decisions_made: 0,
      escalations_raised: 1,
      duration_ms: 0,
      error: `Stage ${stage} failed after recovery attempts`,
    };
  }

  private async executeStage(
    stage: PipelineStage,
    context: AgentContext
  ): Promise<PhaseResult> {
    const stageStart = Date.now();
    const agentNames = OrchestratorAgent.STAGE_AGENT_MAP[stage];

    if (agentNames && agentNames.length > 0 && context.backend) {
      this.log(`Delegating ${stage} to ${agentNames.join(", ")} agent(s) via backend...`);
      try {
        let primaryResult: AgentResult | null = null;
        const allArtifacts: string[] = [];
        let totalDecisions = 0;
        let totalEscalations = 0;
        let lastError: string | undefined;

        for (let i = 0; i < agentNames.length; i++) {
          const agentName = agentNames[i];
          const agent = getAgent(agentName);
          const gitContext = this.buildGitAgentContext(context);

          if (i === 0) {
            const result = await agent.execute(gitContext);
            primaryResult = result;
            if (Array.isArray(result.artifacts_created)) {
              allArtifacts.push(...result.artifacts_created);
            }
            totalDecisions += result.decisions;
            totalEscalations += result.escalations;

            if (!result.success) {
              this.warn(`Primary agent ${agentName} failed for ${stage}`);
              return {
                phase: this.pipelineState!.current_phase,
                stage,
                success: false,
                artifacts_created: allArtifacts,
                decisions_made: totalDecisions,
                escalations_raised: totalEscalations,
                duration_ms: Date.now() - stageStart,
                error: result.error || `Primary agent ${agentName} failed`,
              };
            }
          } else {
            try {
              const reviewContext: AgentContext = {
                ...gitContext,
                specification: `${context.specification}\n\nPrimary agent (${agentNames[0]}) completed. Review context:\n- Success: ${primaryResult!.success}\n- Output: ${primaryResult!.output}\n- Artifacts: ${Array.isArray(primaryResult!.artifacts_created) ? primaryResult!.artifacts_created.join(", ") : String(primaryResult!.artifacts_created)}`,
              };
              const result = await agent.execute(reviewContext);
              if (Array.isArray(result.artifacts_created)) {
                allArtifacts.push(...result.artifacts_created);
              }
              totalDecisions += result.decisions;
              totalEscalations += result.escalations;

              if (!result.success) {
                this.warn(`Review agent ${agentName} reported issues for ${stage}: ${result.error || "unspecified"}`);
                lastError = result.error;
              }
            } catch (err) {
              this.warn(`Review agent ${agentName} failed for ${stage}: ${err instanceof Error ? err.message : String(err)}`);
            }
          }
        }

        return {
          phase: this.pipelineState!.current_phase,
          stage,
          success: primaryResult?.success ?? false,
          artifacts_created: allArtifacts,
          decisions_made: totalDecisions,
          escalations_raised: totalEscalations,
          duration_ms: Date.now() - stageStart,
          error: lastError,
        };
      } catch (err) {
        if (err instanceof BackendUnavailableError) {
          this.warn(`Backend unavailable for ${stage}, falling back to mechanical execution`);
        } else {
          this.warn(`Agents failed for ${stage}: ${err instanceof Error ? err.message : String(err)}`);
        }
      }
    }

    let decisionsMade = 0;
    let escalationsRaised = 0;
    const artifactsCreated: string[] = [];

    switch (stage) {
      case "specify": {
        this.log("Loading specification from git context...");
        let spec: Specification;
        if (context.specification) {
          spec = parseSpecification(context.specification);

          const initCommit = CommitBuilder.buildInitCommit({
            projectName: spec.objective.slice(0, 30),
            phaseCount: 0,
            milestone: this.currentMilestone,
            specification: spec.raw_content,
            requirements: spec.requirements,
            constraints: spec.constraints,
            outOfScope: spec.out_of_scope,
          });

          this.log("Init commit prepared with specification in ---ci--- block");
          artifactsCreated.push(".ciagent/config.json");

          if (this.config.git.auto_commit && this.gitContext!.isGitRepo()) {
            try {
              this.ciFiles!.writeProjectMd({
                name: spec.objective.slice(0, 30),
                coreValue: spec.objective,
                requirements: { validated: [], active: spec.requirements, outOfScope: spec.out_of_scope },
                constraints: spec.constraints.map((c: string) => c),
                context: "",
                keyDecisions: [],
              }, "initial creation");
              execSync(`git add -A && git commit -m "${initCommit.replace(/"/g, '\\"')}"`, {
                cwd: context.project_path,
                stdio: "pipe",
              });
            } catch (err) {
              this.warn(`Specify commit failed: ${err instanceof Error ? err.message : String(err)}`);
            }
          }
        } else {
          const projectMd = this.ciFiles!.readProjectMd();
          if (!projectMd) {
            return {
              phase: 0,
              stage: "specify",
              success: false,
              artifacts_created: [],
              decisions_made: 0,
              escalations_raised: 0,
              duration_ms: Date.now() - stageStart,
              error: "No specification provided and no PROJECT.md found",
            };
          }
        }
        this.pipelineState!.specification_loaded = true;
        break;
      }

      case "clarify": {
        this.log("Running Clarify phase...");
        const projectMd = this.ciFiles!.readProjectMd();
        if (!projectMd) {
          return {
            phase: 0,
            stage: "clarify",
            success: false,
            artifacts_created: [],
            decisions_made: 0,
            escalations_raised: 0,
            duration_ms: Date.now() - stageStart,
            error: "No PROJECT.md to clarify",
          };
        }

        if (this.config.autonomy.level === "full") {
          this.log("Full autonomy: accepting defaults for all clarification questions");
          decisionsMade += 0;
        }

        this.pipelineState!.clarify_completed = true;
        break;
      }

      case "research": {
        this.log("Researching project domain...");
        this.decisionEngine!.setPhase(this.pipelineState!.current_phase);

        const archMd = this.ciFiles!.readArchitectureMd();
        if (!archMd) {
          this.log("No ARCHITECTURE.md found — mechanical research cannot proceed without backend");
          return {
            phase: this.pipelineState!.current_phase,
            stage: "research",
            success: false,
            artifacts_created: artifactsCreated,
            decisions_made: decisionsMade,
            escalations_raised: escalationsRaised,
            duration_ms: Date.now() - stageStart,
            error: "Research stage requires intelligence backend or existing ARCHITECTURE.md",
          };
        }

        if (this.config.git.auto_commit && this.gitContext!.isGitRepo()) {
          const researchCommit = CommitBuilder.buildResearchCommit(
            this.pipelineState!.current_phase,
            this.currentMilestone,
            "initial domain research",
            ["Research completed. Key findings in .ciagent/ARCHITECTURE.md and .ciagent/PROJECT.md updates."]
          );
          try {
            execSync(`git add -A && git commit -m "${researchCommit.replace(/"/g, '\\"')}" --allow-empty`, {
              cwd: context.project_path,
              stdio: "pipe",
            });
          } catch (err) {
            this.warn(`Research commit failed: ${err instanceof Error ? err.message : String(err)}`);
          }
        }

        this.pipelineState!.research_completed = true;
        artifactsCreated.push(".ciagent/ARCHITECTURE.md");
        break;
      }

      case "plan":
        this.log("Planning phase execution...");

        if (this.config.git.branching_strategy === "phase" && this.gitBranch && this.gitContext!.isGitRepo()) {
          this.gitBranch.createPhaseBranch(this.pipelineState!.current_phase, "initial-phase");
        }

        this.pipelineState!.plan_completed = true;
        break;

      case "execute":
        this.log("Executing implementation...");
        if (!context.backend) {
          this.log("No backend available — mechanical execution cannot implement code changes");
          return {
            phase: this.pipelineState!.current_phase,
            stage: "execute",
            success: false,
            artifacts_created: artifactsCreated,
            decisions_made: decisionsMade,
            escalations_raised: escalationsRaised,
            duration_ms: Date.now() - stageStart,
            error: "Execute stage requires intelligence backend for code implementation",
          };
        }
        this.pipelineState!.execute_completed = true;
        break;

      case "test": {
        this.log("Running tests...");
        if (!context.backend) {
          this.log("No backend available — running mechanical test fallback via npm test");
          try {
            const testOutput = execSync("npm test", {
              cwd: context.project_path,
              encoding: "utf-8",
              stdio: ["pipe", "pipe", "pipe"],
              timeout: 120000,
            });
            this.log("npm test passed");
            this.pipelineState!.test_completed = true;
            artifactsCreated.push("test-results");
          } catch (err) {
            const errMsg = err instanceof Error ? err.message : String(err);
            this.warn(`npm test failed: ${errMsg}`);
            return {
              phase: this.pipelineState!.current_phase,
              stage: "test",
              success: false,
              artifacts_created: artifactsCreated,
              decisions_made: decisionsMade,
              escalations_raised: escalationsRaised,
              duration_ms: Date.now() - stageStart,
              error: `Test stage failed: ${errMsg}`,
            };
          }
        }
        break;
      }

      case "verify": {
        this.log("Running verification...");

        const { VerificationPipeline } = await import("../verification/index.js");
        const verification = new VerificationPipeline(context.project_path);
        const verifyResult = await verification.run(this.pipelineState!.current_phase || 1);

        if (!verifyResult.all_passed) {
          return {
            phase: this.pipelineState!.current_phase,
            stage: "verify",
            success: false,
            artifacts_created: artifactsCreated,
            decisions_made: decisionsMade,
            escalations_raised: escalationsRaised,
            duration_ms: Date.now() - stageStart,
            error: `Verification failed: ${verifyResult.escalations_needed.join("; ")}`,
          };
        }

        this.pipelineState!.verify_completed = true;

        if (this.config.git.auto_commit && this.gitContext!.isGitRepo()) {
          const verifyCommit = CommitBuilder.buildVerifyCommit({
            phase: this.pipelineState!.current_phase,
            milestone: this.currentMilestone,
            subject: "automated verification passed",
            requirements: { covered: [], partial: [] },
          });
          try {
            execSync(`git add -A && git commit -m "${verifyCommit.replace(/"/g, '\\"')}" --allow-empty`, {
              cwd: context.project_path,
              stdio: "pipe",
            });
          } catch (err) {
            this.warn(`Verify commit failed: ${err instanceof Error ? err.message : String(err)}`);
          }
        }

        break;
      }

      case "complete": {
        this.log("Pipeline complete");

        if (this.config.git.auto_commit && this.gitContext!.isGitRepo()) {
          const completionCommit = CommitBuilder.buildPhaseCompletionCommit({
            phase: this.pipelineState!.current_phase,
            milestone: this.currentMilestone,
            phaseName: "initial-phase",
            tasksCompleted: 0,
            tasksTotal: 0,
            taskNames: [],
          });
          try {
            execSync(`git add -A && git commit -m "${completionCommit.replace(/"/g, '\\"')}" --allow-empty`, {
              cwd: context.project_path,
              stdio: "pipe",
            });
          } catch (err) {
            this.warn(`Completion commit failed: ${err instanceof Error ? err.message : String(err)}`);
          }
        }

        const versionTag = `${this.currentMilestone}-P${String(this.pipelineState!.current_phase).padStart(2, "0")}`;
        try {
          execSync(`git tag "${versionTag}"`, {
            cwd: context.project_path,
            stdio: "pipe",
          });
          this.log(`Created version tag: ${versionTag}`);
          artifactsCreated.push(`tag:${versionTag}`);
        } catch (err) {
          this.warn(`Version tag creation failed: ${err instanceof Error ? err.message : String(err)}`);
        }

        if (this.config.git.auto_push && this.gitContext!.isGitRepo()) {
          try {
            execSync(`git push origin ${versionTag}`, {
              cwd: context.project_path,
              stdio: "pipe",
            });
            this.log(`Pushed version tag: ${versionTag}`);
          } catch (err) {
            this.warn(`Version tag push failed: ${err instanceof Error ? err.message : String(err)}`);
          }
        }

        break;
      }
    }

    return {
      phase: this.pipelineState!.current_phase,
      stage,
      success: true,
      artifacts_created: artifactsCreated,
      decisions_made: decisionsMade,
      escalations_raised: escalationsRaised,
      duration_ms: Date.now() - stageStart,
    };
  }

  private generateCompletionReport(): string {
    const lines: string[] = [
      "# CIAgent Completion Report",
      "",
      `✓ Pipeline completed successfully (git-native)`,
      "",
      `Duration: ${(this.phaseResults.reduce((a, r) => a + r.duration_ms, 0) / 1000).toFixed(1)}s`,
      `Decisions made: ${this.phaseResults.reduce((a, r) => a + r.decisions_made, 0)}`,
      `Escalations raised: ${this.phaseResults.reduce((a, r) => a + r.escalations_raised, 0)}`,
      "",
    ];

    for (const result of this.phaseResults) {
      const marker = result.success ? "✓" : "✗";
      lines.push(
        `${marker} ${result.stage} (phase ${result.phase}): ${result.duration_ms}ms`
      );
    }

    lines.push("");
    lines.push("Audit trail available via: git log --grep='decisions:'");

    return lines.join("\n");
  }
}