const { query, AbortError } = require("@anthropic-ai/claude-agent-sdk");
const promptBuilder = require("./prompt-builder");
const contextManager = require("./context-manager");
const featureLoader = require("./feature-loader");
const mcpServerFactory = require("./mcp-server-factory");

// Model name mappings
const MODEL_MAP = {
  haiku: "claude-haiku-4-20250514",
  sonnet: "claude-sonnet-4-20250514",
  opus: "claude-opus-4-5-20251101",
};

// Thinking level to budget_tokens mapping
// These values control how much "thinking time" the model gets for extended thinking
const THINKING_BUDGET_MAP = {
  none: null, // No extended thinking
  low: 4096, // Light thinking
  medium: 16384, // Moderate thinking
  high: 65536, // Deep thinking
  ultrathink: 262144, // Ultra-deep thinking (maximum reasoning)
};

/**
 * Feature Executor - Handles feature implementation using Claude Agent SDK
 */
class FeatureExecutor {
  /**
   * Get the model string based on feature's model setting
   */
  getModelString(feature) {
    const modelKey = feature.model || "opus"; // Default to opus
    return MODEL_MAP[modelKey] || MODEL_MAP.opus;
  }

  /**
   * Get thinking configuration based on feature's thinkingLevel
   */
  getThinkingConfig(feature) {
    const level = feature.thinkingLevel || "none";
    const budgetTokens = THINKING_BUDGET_MAP[level];

    if (budgetTokens === null) {
      return null; // No extended thinking
    }

    return {
      type: "enabled",
      budget_tokens: budgetTokens,
    };
  }

  /**
   * Prepare for ultrathink execution - validate and warn
   */
  prepareForUltrathink(feature, thinkingConfig) {
    if (feature.thinkingLevel !== 'ultrathink') {
      return { ready: true };
    }

    const warnings = [];
    const recommendations = [];

    // Check CLI installation
    const claudeCliDetector = require('./claude-cli-detector');
    const cliInfo = claudeCliDetector.getInstallationInfo();
    
    if (cliInfo.status === 'not_installed') {
      warnings.push('Claude Code CLI not detected - ultrathink may have timeout issues');
      recommendations.push('Install Claude Code CLI for optimal ultrathink performance');
    }

    // Validate budget tokens
    if (thinkingConfig && thinkingConfig.budget_tokens > 32000) {
      warnings.push(`Ultrathink budget (${thinkingConfig.budget_tokens} tokens) exceeds recommended 32K - may cause long-running requests`);
      recommendations.push('Consider using batch processing for budgets above 32K');
    }

    // Cost estimate (rough)
    const estimatedCost = (thinkingConfig?.budget_tokens || 0) / 1000 * 0.015; // Rough estimate
    if (estimatedCost > 1.0) {
      warnings.push(`Estimated cost: ~$${estimatedCost.toFixed(2)} per execution`);
    }

    // Time estimate
    warnings.push('Ultrathink tasks typically take 45-180 seconds');

    return {
      ready: true,
      warnings,
      recommendations,
      estimatedCost,
      estimatedTime: '45-180 seconds',
      cliInfo
    };
  }

  /**
   * Sleep helper
   */
  sleep(ms) {
    return new Promise((resolve) => setTimeout(resolve, ms));
  }

  /**
   * Implement a single feature using Claude Agent SDK
   * Uses a Plan-Act-Verify loop with detailed phase logging
   */
  async implementFeature(feature, projectPath, sendToRenderer, execution) {
    console.log(`[FeatureExecutor] Implementing: ${feature.description}`);

    try {
      // ========================================
      // PHASE 1: PLANNING
      // ========================================
      const planningMessage = `📋 Planning implementation for: ${feature.description}\n`;
      await contextManager.writeToContextFile(projectPath, feature.id, planningMessage);

      sendToRenderer({
        type: "auto_mode_phase",
        featureId: feature.id,
        phase: "planning",
        message: `Planning implementation for: ${feature.description}`,
      });
      console.log(`[FeatureExecutor] Phase: PLANNING for ${feature.description}`);

      const abortController = new AbortController();
      execution.abortController = abortController;

      // Create custom MCP server with UpdateFeatureStatus tool
      const featureToolsServer = mcpServerFactory.createFeatureToolsServer(
        featureLoader.updateFeatureStatus.bind(featureLoader),
        projectPath
      );

      // Get model and thinking configuration from feature settings
      const modelString = this.getModelString(feature);
      const thinkingConfig = this.getThinkingConfig(feature);

      // Prepare for ultrathink if needed
      if (feature.thinkingLevel === 'ultrathink') {
        const preparation = this.prepareForUltrathink(feature, thinkingConfig);
        
        console.log(`[FeatureExecutor] Ultrathink preparation:`, preparation);
        
        // Log warnings
        if (preparation.warnings && preparation.warnings.length > 0) {
          preparation.warnings.forEach(warning => {
            console.warn(`[FeatureExecutor] ⚠️ ${warning}`);
          });
        }
        
        // Send preparation info to renderer
        sendToRenderer({
          type: 'auto_mode_ultrathink_preparation',
          featureId: feature.id,
          warnings: preparation.warnings || [],
          recommendations: preparation.recommendations || [],
          estimatedCost: preparation.estimatedCost,
          estimatedTime: preparation.estimatedTime
        });
      }

      console.log(`[FeatureExecutor] Using model: ${modelString}, thinking: ${feature.thinkingLevel || 'none'}`);

      // Configure options for the SDK query
      const options = {
        model: modelString,
        systemPrompt: promptBuilder.getCodingPrompt(),
        maxTurns: 1000,
        cwd: projectPath,
        mcpServers: {
          "automaker-tools": featureToolsServer
        },
        allowedTools: [
          "Read",
          "Write",
          "Edit",
          "Glob",
          "Grep",
          "Bash",
          "WebSearch",
          "WebFetch",
          "mcp__automaker-tools__UpdateFeatureStatus",
        ],
        permissionMode: "acceptEdits",
        sandbox: {
          enabled: true,
          autoAllowBashIfSandboxed: true,
        },
        abortController: abortController,
      };

      // Add thinking configuration if enabled
      if (thinkingConfig) {
        options.thinking = thinkingConfig;
      }

      // Build the prompt for this specific feature
      const prompt = promptBuilder.buildFeaturePrompt(feature);

      // Planning: Analyze the codebase and create implementation plan
      sendToRenderer({
        type: "auto_mode_progress",
        featureId: feature.id,
        content:
          "Analyzing codebase structure and creating implementation plan...",
      });

      // Small delay to show planning phase
      await this.sleep(500);

      // ========================================
      // PHASE 2: ACTION
      // ========================================
      const actionMessage = `⚡ Executing implementation for: ${feature.description}\n`;
      await contextManager.writeToContextFile(projectPath, feature.id, actionMessage);

      sendToRenderer({
        type: "auto_mode_phase",
        featureId: feature.id,
        phase: "action",
        message: `Executing implementation for: ${feature.description}`,
      });
      console.log(`[FeatureExecutor] Phase: ACTION for ${feature.description}`);

      // Send query
      const currentQuery = query({ prompt, options });
      execution.query = currentQuery;

      // Stream responses
      let responseText = "";
      let hasStartedToolUse = false;
      for await (const msg of currentQuery) {
        // Check if this specific feature was aborted
        if (!execution.isActive()) break;

        if (msg.type === "assistant" && msg.message?.content) {
          for (const block of msg.message.content) {
            if (block.type === "text") {
              responseText += block.text;

              // Write to context file
              await contextManager.writeToContextFile(projectPath, feature.id, block.text);

              // Stream progress to renderer
              sendToRenderer({
                type: "auto_mode_progress",
                featureId: feature.id,
                content: block.text,
              });
            } else if (block.type === "tool_use") {
              // First tool use indicates we're actively implementing
              if (!hasStartedToolUse) {
                hasStartedToolUse = true;
                const startMsg = "Starting code implementation...\n";
                await contextManager.writeToContextFile(projectPath, feature.id, startMsg);
                sendToRenderer({
                  type: "auto_mode_progress",
                  featureId: feature.id,
                  content: startMsg,
                });
              }

              // Write tool use to context file
              const toolMsg = `\n🔧 Tool: ${block.name}\n`;
              await contextManager.writeToContextFile(projectPath, feature.id, toolMsg);

              // Notify about tool use
              sendToRenderer({
                type: "auto_mode_tool",
                featureId: feature.id,
                tool: block.name,
                input: block.input,
              });
            }
          }
        }
      }

      execution.query = null;
      execution.abortController = null;

      // ========================================
      // PHASE 3: VERIFICATION
      // ========================================
      const verificationMessage = `✅ Verifying implementation for: ${feature.description}\n`;
      await contextManager.writeToContextFile(projectPath, feature.id, verificationMessage);

      sendToRenderer({
        type: "auto_mode_phase",
        featureId: feature.id,
        phase: "verification",
        message: `Verifying implementation for: ${feature.description}`,
      });
      console.log(`[FeatureExecutor] Phase: VERIFICATION for ${feature.description}`);

      const checkingMsg =
        "Verifying implementation and checking test results...\n";
      await contextManager.writeToContextFile(projectPath, feature.id, checkingMsg);
      sendToRenderer({
        type: "auto_mode_progress",
        featureId: feature.id,
        content: checkingMsg,
      });

      // Re-load features to check if it was marked as verified or waiting_approval (for skipTests)
      const updatedFeatures = await featureLoader.loadFeatures(projectPath);
      const updatedFeature = updatedFeatures.find((f) => f.id === feature.id);
      // For skipTests features, waiting_approval is also considered a success
      const passes = updatedFeature?.status === "verified" || 
                     (updatedFeature?.skipTests && updatedFeature?.status === "waiting_approval");

      // Send verification result
      const resultMsg = passes
        ? "✓ Verification successful: All tests passed\n"
        : "✗ Verification: Tests need attention\n";

      await contextManager.writeToContextFile(projectPath, feature.id, resultMsg);
      sendToRenderer({
        type: "auto_mode_progress",
        featureId: feature.id,
        content: resultMsg,
      });

      return {
        passes,
        message: responseText.substring(0, 500), // First 500 chars
      };
    } catch (error) {
      if (error instanceof AbortError || error?.name === "AbortError") {
        console.log("[FeatureExecutor] Feature run aborted");
        if (execution) {
          execution.abortController = null;
          execution.query = null;
        }
        return {
          passes: false,
          message: "Auto mode aborted",
        };
      }

      console.error("[FeatureExecutor] Error implementing feature:", error);

      // Clean up
      if (execution) {
        execution.abortController = null;
        execution.query = null;
      }

      throw error;
    }
  }

  /**
   * Resume feature implementation with previous context
   */
  async resumeFeatureWithContext(feature, projectPath, sendToRenderer, previousContext, execution) {
    console.log(`[FeatureExecutor] Resuming with context for: ${feature.description}`);

    try {
      const resumeMessage = `\n🔄 Resuming implementation for: ${feature.description}\n`;
      await contextManager.writeToContextFile(projectPath, feature.id, resumeMessage);

      sendToRenderer({
        type: "auto_mode_phase",
        featureId: feature.id,
        phase: "action",
        message: `Resuming implementation for: ${feature.description}`,
      });

      const abortController = new AbortController();
      execution.abortController = abortController;

      // Create custom MCP server with UpdateFeatureStatus tool
      const featureToolsServer = mcpServerFactory.createFeatureToolsServer(
        featureLoader.updateFeatureStatus.bind(featureLoader),
        projectPath
      );

      // Get model and thinking configuration from feature settings
      const modelString = this.getModelString(feature);
      const thinkingConfig = this.getThinkingConfig(feature);

      // Prepare for ultrathink if needed
      if (feature.thinkingLevel === 'ultrathink') {
        const preparation = this.prepareForUltrathink(feature, thinkingConfig);
        
        console.log(`[FeatureExecutor] Ultrathink preparation:`, preparation);
        
        // Log warnings
        if (preparation.warnings && preparation.warnings.length > 0) {
          preparation.warnings.forEach(warning => {
            console.warn(`[FeatureExecutor] ⚠️ ${warning}`);
          });
        }
        
        // Send preparation info to renderer
        sendToRenderer({
          type: 'auto_mode_ultrathink_preparation',
          featureId: feature.id,
          warnings: preparation.warnings || [],
          recommendations: preparation.recommendations || [],
          estimatedCost: preparation.estimatedCost,
          estimatedTime: preparation.estimatedTime
        });
      }

      console.log(`[FeatureExecutor] Resuming with model: ${modelString}, thinking: ${feature.thinkingLevel || 'none'}`);

      const options = {
        model: modelString,
        systemPrompt: promptBuilder.getVerificationPrompt(),
        maxTurns: 1000,
        cwd: projectPath,
        mcpServers: {
          "automaker-tools": featureToolsServer
        },
        allowedTools: ["Read", "Write", "Edit", "Glob", "Grep", "Bash", "WebSearch", "WebFetch", "mcp__automaker-tools__UpdateFeatureStatus"],
        permissionMode: "acceptEdits",
        sandbox: {
          enabled: true,
          autoAllowBashIfSandboxed: true,
        },
        abortController: abortController,
      };

      // Add thinking configuration if enabled
      if (thinkingConfig) {
        options.thinking = thinkingConfig;
      }

      // Build prompt with previous context
      const prompt = promptBuilder.buildResumePrompt(feature, previousContext);

      const currentQuery = query({ prompt, options });
      execution.query = currentQuery;

      let responseText = "";
      for await (const msg of currentQuery) {
        // Check if this specific feature was aborted
        if (!execution.isActive()) break;

        if (msg.type === "assistant" && msg.message?.content) {
          for (const block of msg.message.content) {
            if (block.type === "text") {
              responseText += block.text;

              await contextManager.writeToContextFile(projectPath, feature.id, block.text);

              sendToRenderer({
                type: "auto_mode_progress",
                featureId: feature.id,
                content: block.text,
              });
            } else if (block.type === "tool_use") {
              const toolMsg = `\n🔧 Tool: ${block.name}\n`;
              await contextManager.writeToContextFile(projectPath, feature.id, toolMsg);

              sendToRenderer({
                type: "auto_mode_tool",
                featureId: feature.id,
                tool: block.name,
                input: block.input,
              });
            }
          }
        }
      }

      execution.query = null;
      execution.abortController = null;

      // Check if feature was marked as verified or waiting_approval (for skipTests)
      const updatedFeatures = await featureLoader.loadFeatures(projectPath);
      const updatedFeature = updatedFeatures.find((f) => f.id === feature.id);
      // For skipTests features, waiting_approval is also considered a success
      const passes = updatedFeature?.status === "verified" || 
                     (updatedFeature?.skipTests && updatedFeature?.status === "waiting_approval");

      const finalMsg = passes
        ? "✓ Feature successfully verified and completed\n"
        : "⚠ Feature still in progress - may need additional work\n";

      await contextManager.writeToContextFile(projectPath, feature.id, finalMsg);

      sendToRenderer({
        type: "auto_mode_progress",
        featureId: feature.id,
        content: finalMsg,
      });

      return {
        passes,
        message: responseText.substring(0, 500),
      };
    } catch (error) {
      if (error instanceof AbortError || error?.name === "AbortError") {
        console.log("[FeatureExecutor] Resume aborted");
        if (execution) {
          execution.abortController = null;
          execution.query = null;
        }
        return {
          passes: false,
          message: "Resume aborted",
        };
      }

      console.error("[FeatureExecutor] Error resuming feature:", error);
      if (execution) {
        execution.abortController = null;
        execution.query = null;
      }
      throw error;
    }
  }

  /**
   * Commit changes for a feature without doing additional work
   * Analyzes changes and creates a proper conventional commit message
   */
  async commitChangesOnly(feature, projectPath, sendToRenderer, execution) {
    console.log(`[FeatureExecutor] Committing changes for: ${feature.description}`);

    try {
      const commitMessage = `\n📝 Committing changes for: ${feature.description}\n`;
      await contextManager.writeToContextFile(projectPath, feature.id, commitMessage);

      sendToRenderer({
        type: "auto_mode_progress",
        featureId: feature.id,
        content: "Analyzing changes and creating commit...",
      });

      const abortController = new AbortController();
      execution.abortController = abortController;

      // Create custom MCP server with UpdateFeatureStatus tool
      const featureToolsServer = mcpServerFactory.createFeatureToolsServer(
        featureLoader.updateFeatureStatus.bind(featureLoader),
        projectPath
      );

      const options = {
        model: "claude-sonnet-4-20250514", // Use sonnet for commit task
        systemPrompt: `You are a git commit assistant that creates professional conventional commit messages.

IMPORTANT RULES:
- DO NOT modify any code
- DO NOT write tests
- DO NOT do anything except analyzing changes and committing them
- Use the git command line tools via Bash
- Create proper conventional commit messages based on what was actually changed`,
        maxTurns: 15, // Allow some turns to analyze and commit
        cwd: projectPath,
        mcpServers: {
          "automaker-tools": featureToolsServer
        },
        allowedTools: ["Bash", "mcp__automaker-tools__UpdateFeatureStatus"],
        permissionMode: "acceptEdits",
        sandbox: {
          enabled: false, // Need to run git commands
        },
        abortController: abortController,
      };

      // Prompt that guides the agent to create a proper conventional commit
      const prompt = `Please commit the current changes with a proper conventional commit message.

**Feature Context:**
Category: ${feature.category}
Description: ${feature.description}

**Your Task:**

1. First, run \`git status\` to see all untracked and modified files
2. Run \`git diff\` to see the actual changes (both staged and unstaged)
3. Run \`git log --oneline -5\` to see recent commit message styles in this repo
4. Analyze all the changes and draft a proper conventional commit message:
   - Use conventional commit format: \`type(scope): description\`
   - Types: feat, fix, refactor, style, docs, test, chore
   - The description should be concise (under 72 chars) and focus on "what" was done
   - Summarize the nature of the changes (new feature, enhancement, bug fix, etc.)
   - Make sure the commit message accurately reflects the actual code changes
5. Run \`git add .\` to stage all changes
6. Create the commit with a message ending with:
   🤖 Generated with [Claude Code](https://claude.com/claude-code)

   Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>

Use a HEREDOC for the commit message to ensure proper formatting:
\`\`\`bash
git commit -m "$(cat <<'EOF'
type(scope): Short description here

Optional longer description if needed.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4 <noreply@anthropic.com>
EOF
)"
\`\`\`

**IMPORTANT:**
- DO NOT use the feature description verbatim as the commit message
- Analyze the actual code changes to determine the appropriate commit message
- The commit message should be professional and follow conventional commit standards
- DO NOT modify any code or run tests - ONLY commit the existing changes`;

      const currentQuery = query({ prompt, options });
      execution.query = currentQuery;

      let responseText = "";
      for await (const msg of currentQuery) {
        if (!execution.isActive()) break;

        if (msg.type === "assistant" && msg.message?.content) {
          for (const block of msg.message.content) {
            if (block.type === "text") {
              responseText += block.text;

              await contextManager.writeToContextFile(projectPath, feature.id, block.text);

              sendToRenderer({
                type: "auto_mode_progress",
                featureId: feature.id,
                content: block.text,
              });
            } else if (block.type === "tool_use") {
              const toolMsg = `\n🔧 Tool: ${block.name}\n`;
              await contextManager.writeToContextFile(projectPath, feature.id, toolMsg);

              sendToRenderer({
                type: "auto_mode_tool",
                featureId: feature.id,
                tool: block.name,
                input: block.input,
              });
            }
          }
        }
      }

      execution.query = null;
      execution.abortController = null;

      const finalMsg = "✓ Changes committed successfully\n";
      await contextManager.writeToContextFile(projectPath, feature.id, finalMsg);

      sendToRenderer({
        type: "auto_mode_progress",
        featureId: feature.id,
        content: finalMsg,
      });

      return {
        passes: true,
        message: responseText.substring(0, 500),
      };
    } catch (error) {
      if (error instanceof AbortError || error?.name === "AbortError") {
        console.log("[FeatureExecutor] Commit aborted");
        if (execution) {
          execution.abortController = null;
          execution.query = null;
        }
        return {
          passes: false,
          message: "Commit aborted",
        };
      }

      console.error("[FeatureExecutor] Error committing feature:", error);
      if (execution) {
        execution.abortController = null;
        execution.query = null;
      }
      throw error;
    }
  }
}

module.exports = new FeatureExecutor();