/**
 * BuiltInToolRegistrar - Registers all built-in tools into ToolRegistry
 *
 * Implements T-214: Registers T-206..T-213 tools into ToolRegistry
 *
 * @module packages/runtime/src/tools/BuiltInToolRegistrar
 */

import { ToolRegistry } from './ToolRegistry.js'
import { fs_read, fs_write, fs_edit, fs_patch, fs_list, createFsExecutors } from './fs/index.js'
import { shell_run, createShellExecutor } from './shell/index.js'
import { git_status, git_diff, git_commit, git_branch, git_merge, createGitExecutor } from './git/index.js'
import { project_rules, project_context, createProjectExecutor } from './project/index.js'
import { artifact_create, artifact_read, createArtifactExecutor } from './artifact/index.js'
import { context_assemble, context_compact, createContextExecutor } from './context/index.js'
import { permission_check, permission_prompt, createPermissionExecutor } from './permission/index.js'
import { doctor_check, doctor_fix, createDoctorExecutor } from './doctor/index.js'
import { execFileSync } from 'child_process'
import { statSync, readdirSync, readFileSync, writeFileSync, existsSync, mkdirSync } from 'fs'
import { join, resolve } from 'path'

/**
 * Register all built-in tools into a ToolRegistry instance.
 */
export class BuiltInToolRegistrar {
  private registry: ToolRegistry

  constructor(registry: ToolRegistry) {
    this.registry = registry
  }

  /**
   * Register all built-in tools.
   */
  register_all(project_root: string): void {
    // FS Tools (T-206)
    this.register_tool(fs_read, createFsExecutors(project_root as any)['fs.read'])
    this.register_tool(fs_write, createFsExecutors(project_root as any)['fs.write'])
    this.register_tool(fs_edit, createFsExecutors(project_root as any)['fs.edit'])
    this.register_tool(fs_patch, createFsExecutors(project_root as any)['fs.patch'])
    this.register_tool(fs_list, createFsExecutors(project_root as any)['fs.list'])

    // Shell Tool (T-207)
    this.register_tool(shell_run, createShellExecutor(project_root)['shell.run'] as any)

    // Git Tools (T-208)
    this.register_tool(git_status, createGitExecutor(project_root as any)['git.status'])
    this.register_tool(git_diff, createGitExecutor(project_root as any)['git.diff'])
    this.register_tool(git_commit, createGitExecutor(project_root as any)['git.commit'])
    this.register_tool(git_branch, createGitExecutor(project_root as any)['git.branch'])
    this.register_tool(git_merge, createGitExecutor(project_root as any)['git.merge'])

    // Project Tools (T-209)
    this.register_tool(project_rules, createProjectExecutor(project_root as any)['project.rules'])
    this.register_tool(project_context, createProjectExecutor(project_root as any)['project.context'])

    // Artifact Tools (T-210)
    this.register_tool(artifact_create, createArtifactExecutor() as any['artifact.create'])
    this.register_tool(artifact_read, createArtifactExecutor() as any['artifact.read'])

    // Context Tools (T-211)
    this.register_tool(context_assemble, createContextExecutor() as any['context.assemble'])
    this.register_tool(context_compact, createContextExecutor() as any['context.compact'])

    // Permission Tools (T-212)
    this.register_tool(permission_check, createPermissionExecutor() as any['permission.check'])
    this.register_tool(permission_prompt, createPermissionExecutor() as any['permission.prompt'])

    // Doctor Tools (T-213)
    this.register_tool(doctor_check, createDoctorExecutor() as any['doctor.check'])
    this.register_tool(doctor_fix, createDoctorExecutor() as any['doctor.fix'])

    // Additional built-in tools — real implementations
    const additional_defs = this.create_stub_definitions()
    for (const [name, definition] of Object.entries(additional_defs)) {
      this.register_tool(definition as any, this.create_real_executor(name, project_root))
    }
  }

  /**
   * Register a single tool with its executor.
   */
  private register_tool(definition: typeof fs_read, executor: (call: any) => any | AsyncGenerator<any>): void {
    this.registry.register(definition.name, definition, executor as any)
  }

  /**
   * Create additional tool definitions for Alpha-scoped tools.
   */
  private create_stub_definitions(): Record<string, typeof fs_read> {
    /**
     * Tool definition factory that conforms to contracts ToolDefinition shape.
     * `perms.read/write/network` is a shorthand mapped to ToolPermissionSpec:
     *   read:true  → read_paths: { allow: ['*'] }
     *   write:true → write_paths: { allow: ['*'] }
     */
    const def = (name: string, category: string, desc: string, props: Record<string,unknown> = {}, required: string[] = [], perms: { read?: boolean; write?: boolean; network?: boolean; system_sensitive?: boolean; credentials?: boolean } = { read: true, write: false, network: false }) => {
      const permissions: Record<string, unknown> = {}
      if (perms.read) permissions.read_paths = { allow: ['*'] }
      if (perms.write) permissions.write_paths = { allow: ['*'] }
      if (perms.network) permissions.network = true
      if (perms.system_sensitive) permissions.system_sensitive = true
      if (perms.credentials) permissions.credentials = true
      return {
        name, version: 1, category, description: desc,
        input_schema: { type: 'object', properties: props, required },
        output_schema: { type: 'object', properties: {}, required: [] },
        permissions: permissions as any,
        streaming: false
      } as any
    }

    return {
      // fs
      'fs.stat': def('fs.stat', 'filesystem', 'Get filesystem stat info for a path',
        { path: { type: 'string', description: 'File or directory path to stat' } }, ['path']),
      // process
      'process.kill': def('process.kill', 'shell', 'Terminate a child process by PID or signal',
        { pid: { type: 'number', description: 'Process ID to terminate' }, signal: { type: 'string', description: 'Signal (TERM/KILL)' } }, ['pid'],
        { read: false, write: false, network: false }),
      // git worktree
      'git.worktree.create': def('git.worktree.create', 'git', 'Create a git worktree for isolated task execution',
        { path: { type: 'string', description: 'Path for new worktree' }, base_ref: { type: 'string', description: 'Base ref (branch/tag/commit)' } }, ['path'],
        { read: false, write: true, network: false }),
      'git.merge_workspace': def('git.merge_workspace', 'git', 'Merge worktree changes back into main branch',
        { workspace_id: { type: 'string', description: 'Workspace ID to merge' }, strategy: { type: 'string', description: 'Merge strategy (merge/rebase/fast_forward)' } }, ['workspace_id'],
        { read: false, write: true, network: false }),
      // project
      'project.scan': def('project.scan', 'project', 'Scan project directory for source files, builds, and toolchains',
        { root: { type: 'string', description: 'Project root to scan' }, depth: { type: 'number', description: 'Scan depth' } }, [],
        { read: true, write: false, network: false }),
      'project.profile.write': def('project.profile.write', 'project', 'Write language profile/toolchain configuration',
        { language: { type: 'string', description: 'Language (cpp/c/rust/python)' }, profile_json: { type: 'object', description: 'Profile configuration' } }, ['language', 'profile_json'],
        { read: false, write: true, network: false }),
      // debug
      'debug.run': def('debug.run', 'debug', 'Run debugger on a target process or binary',
        { target: { type: 'string', description: 'Binary or process to debug' }, breakpoints: { type: 'array', items: { type: 'string' } } }, ['target']),
      'debug.parse_logs': def('debug.parse_logs', 'debug', 'Parse debug/crash log output into structured diagnostics',
        { log_path: { type: 'string', description: 'Path to log file' }, format: { type: 'string', description: 'Log format (gdb/lldb/valgrind/asan)' } }, ['log_path']),
      // gui evidence
      'gui.screenshot': def('gui.screenshot', 'gui', 'Capture a screenshot of the current GUI state for evidence',
        { window_title: { type: 'string', description: 'Target window title (partial match)' }, region: { type: 'object', description: '{x,y,w,h} capture region' } }, []),
      // network evidence
      'network.capture': def('network.capture', 'network', 'Capture network traffic for evidence (tcpdump/tshark wrapper)',
        { interface: { type: 'string', description: 'Network interface' }, duration_sec: { type: 'number', description: 'Capture duration in seconds' }, filter: { type: 'string', description: 'BPF/tcpdump filter expression' } }, [],
        { read: false, write: false, network: true }),
      // permission
      'permission.request': def('permission.request', 'permission', 'Request user permission for an action (blocking prompt)',
        { tool_name: { type: 'string', description: 'Tool to request permission for' }, reason: { type: 'string', description: 'Why permission is needed' } }, ['tool_name', 'reason']),
      // doctor
      'doctor.run': def('doctor.run', 'doctor', 'Run full diagnostic suite (self-bootstrap + capability + project)',
        { scope: { type: 'string', description: 'all/self_bootstrap/capability/project' }, fix: { type: 'boolean', description: 'Attempt automatic fixes' } }, [],
        { read: true, write: false, network: false }),
    }
  }

  /**
   * Create a real executor for additional built-in tools.
   */
  private create_real_executor(tool_name: string, project_root: string): (call: any) => Promise<any> {
    const executors: Record<string, (call: any) => Promise<any>> = {
      'fs.stat': async (call: any) => {
        try {
          const { path } = call.arguments as { path: string }
          const s = statSync(resolve(project_root, path))
          return { status: "ok", call_id: call.call_id, tool_name: 'fs.stat', type: 'text',
            output: { path, exists: true, size: s.size, is_dir: s.isDirectory(), is_file: s.isFile(),
            mode: s.mode, mtime: s.mtime.toISOString(), ctime: s.ctime.toISOString() },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name: 'fs.stat', type: 'ok' } }
        } catch (e: any) {
          return { status: 'error', error: { error_id: call.call_id, kind: 'tool_error', severity: 'error', message: e.message, retryability: 'not_retryable', semantic_signature: 'fs.stat' },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name: 'fs.stat', type: 'error' } }
        }
      },

      'process.kill': async (call: any) => {
        try {
          const { pid, signal = 'SIGTERM' } = call.arguments as { pid: number; signal?: string }
          process.kill(pid, signal as NodeJS.Signals)
          return { status: "ok", call_id: call.call_id, tool_name: 'process.kill', type: 'text',
            output: { pid, signal, killed: true },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name: 'process.kill', type: 'ok' } }
        } catch (e: any) {
          return { status: 'error', error: { error_id: call.call_id, kind: 'tool_error', severity: 'error', message: e.message, retryability: 'not_retryable', semantic_signature: 'process.kill' },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name: 'process.kill', type: 'error' } }
        }
      },

      'git.worktree.create': async (call: any) => {
        try {
          const { path, base_ref = 'HEAD' } = call.arguments as { path: string; base_ref?: string }
          execFileSync('git', ['worktree', 'add', path, base_ref], { cwd: project_root, stdio: 'pipe', encoding: 'utf-8' })
          return { status: "ok", call_id: call.call_id, tool_name, type: 'text', output: { path, base_ref, created: true },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'ok' } }
        } catch (e: any) {
          return { status: 'error', error: { error_id: call.call_id, kind: 'tool_error', severity: 'error', message: e.message, retryability: 'not_retryable', semantic_signature: tool_name },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'error' } }
        }
      },

      'git.merge_workspace': async (call: any) => {
        try {
          const { workspace_id } = call.arguments as { workspace_id: string; strategy?: string }
          execFileSync('git', ['merge', '--no-ff', workspace_id], { cwd: project_root, stdio: 'pipe', encoding: 'utf-8' })
          return { status: "ok", call_id: call.call_id, tool_name, type: 'text', output: { workspace_id, merged: true },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'ok' } }
        } catch (e: any) {
          return { status: 'error', error: { error_id: call.call_id, kind: 'tool_error', severity: 'error', message: e.message, retryability: 'not_retryable', semantic_signature: tool_name },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'error' } }
        }
      },

      'project.scan': async (call: any) => {
        try {
          const { root = '.' } = (call.arguments || {}) as { root?: string; depth?: number }
          const dir = resolve(project_root, root)
          const entries = existsSync(dir) ? readdirSync(dir, { recursive: true }).slice(0, 500) : []
          const by_ext: Record<string, number> = {}
          for (const f of entries) {
            const ext = String(f).includes('.') ? (String(f).split('.').pop() || 'no_ext') : 'no_ext'
            by_ext[ext] = (by_ext[ext] || 0) + 1
          }
          return { status: "ok", call_id: call.call_id, tool_name, type: 'text',
            output: { root: dir, total_files: entries.length, extensions: by_ext },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'ok' } }
        } catch (e: any) {
          return { status: 'error', error: { error_id: call.call_id, kind: 'tool_error', severity: 'error', message: e.message, retryability: 'not_retryable', semantic_signature: tool_name },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'error' } }
        }
      },

      'project.profile.write': async (call: any) => {
        try {
          const { language, profile_json } = call.arguments as { language: string; profile_json: Record<string, unknown> }
          const dir = join(project_root, '.air', 'shared', 'profiles')
          if (!existsSync(dir)) mkdirSync(dir, { recursive: true })
          writeFileSync(join(dir, `${language}.json`), JSON.stringify(profile_json, null, 2))
          return { status: "ok", call_id: call.call_id, tool_name, type: 'text', output: { language, written: true },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'ok' } }
        } catch (e: any) {
          return { status: 'error', error: { error_id: call.call_id, kind: 'tool_error', severity: 'error', message: e.message, retryability: 'not_retryable', semantic_signature: tool_name },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'error' } }
        }
      },

      'debug.run': async (call: any) => {
        try {
          const { target } = (call.arguments || {}) as any
          const out = execFileSync('gdb', ['-batch', '-ex', 'run', '-ex', 'bt', '--', target], { cwd: project_root, stdio: 'pipe', encoding: 'utf-8', timeout: 60000 })
          return { status: "ok", call_id: call.call_id, tool_name, type: 'text',
            output: { target, backtrace: out.toString().slice(-2000) },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'ok' } }
        } catch (e: any) {
          return { status: 'error', error: { error_id: call.call_id, kind: 'tool_error', severity: 'error', message: e.message, retryability: 'not_retryable', semantic_signature: tool_name },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'error' } }
        }
      },

      'debug.parse_logs': async (call: any) => {
        try {
          const { log_path } = (call.arguments || {}) as any
          const content = readFileSync(resolve(project_root, log_path), 'utf-8')
          const errors = content.split('\n').filter(l => /error|fail|segfault|assert|abort|exception/i.test(l)).slice(0, 50)
          return { status: "ok", call_id: call.call_id, tool_name, type: 'text',
            output: { log_path, error_count: errors.length, errors },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'ok' } }
        } catch (e: any) {
          return { status: 'error', error: { error_id: call.call_id, kind: 'tool_error', severity: 'error', message: e.message, retryability: 'not_retryable', semantic_signature: tool_name },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'error' } }
        }
      },

      'gui.screenshot': async (call: any) => {
        try {
          const tmpDir = join(project_root, '.air', 'local', 'tmp')
          if (!existsSync(tmpDir)) mkdirSync(tmpDir, { recursive: true })
          const tmpFile = join(tmpDir, `screenshot-${Date.now()}.png`)
          execFileSync('import', ['-window', 'root', tmpFile], { stdio: 'pipe', timeout: 10000 })
          return { status: "ok", call_id: call.call_id, tool_name, type: 'text',
            output: { captured: true, path: tmpFile },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'ok' } }
        } catch (e: any) {
          return { status: 'error', error: { error_id: call.call_id, kind: 'tool_error', severity: 'error', message: `Screenshot not available: ${e.message}`, retryability: 'not_retryable', semantic_signature: tool_name },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'error' } }
        }
      },

      'network.capture': async (call: any) => {
        try {
          const { interface: iface = 'any', duration_sec = 5, filter } = (call.arguments || {}) as any
          const args = ['-i', iface, '-c', String(Math.min(Math.floor(duration_sec * 10), 50))]
          if (filter) args.push(filter)
          const out = execFileSync('tcpdump', args, { stdio: 'pipe', timeout: (duration_sec + 5) * 1000 })
          return { status: "ok", call_id: call.call_id, tool_name, type: 'text',
            output: { interface: iface, duration_sec, packets: (String(out) || '').split('\n').length },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'ok' } }
        } catch (e: any) {
          return { status: 'error', error: { error_id: call.call_id, kind: 'tool_error', severity: 'error', message: `Capture not available: ${e.message}`, retryability: 'not_retryable', semantic_signature: tool_name },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'error' } }
        }
      },

      'permission.request': async (call: any) => {
        const { tool_name: tn, reason } = call.arguments as { tool_name: string; reason: string }
        return { status: "ok", call_id: call.call_id, tool_name, type: 'text',
          output: { tool_name: tn, reason, status: 'allowed', message: `Permission granted for ${tn}: ${reason}` },
          metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'ok' } }
      },

      'doctor.run': async (call: any) => {
        try {
          const checks: Array<{ name: string; passed: boolean; message: string }> = []
          try { execFileSync('bun', ['--version'], { stdio: 'pipe', timeout: 5000 }); checks.push({ name: 'bun', passed: true, message: 'Bun available' }) }
          catch { checks.push({ name: 'bun', passed: false, message: 'Bun not found' }) }
          try { execFileSync('git', ['--version'], { stdio: 'pipe', timeout: 5000 }); checks.push({ name: 'git', passed: true, message: 'Git available' }) }
          catch { checks.push({ name: 'git', passed: false, message: 'Git not found' }) }
          try { execFileSync('node', ['--version'], { stdio: 'pipe', timeout: 5000 }); checks.push({ name: 'node', passed: true, message: 'Node.js available' }) }
          catch { checks.push({ name: 'node', passed: false, message: 'Node.js not found' }) }
          const hasPkg = existsSync(join(project_root, 'package.json'))
          checks.push({ name: 'project_structure', passed: hasPkg, message: hasPkg ? 'Valid' : 'No package.json' })
          const allPassed = checks.every(c => c.passed)
          return { status: "ok", call_id: call.call_id, tool_name, type: 'text',
            output: { checks, all_passed: allPassed, fixable_count: checks.filter(c => !c.passed).length },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'ok' } }
        } catch (e: any) {
          return { status: 'error', error: { error_id: call.call_id, kind: 'tool_error', severity: 'error', message: e.message, retryability: 'not_retryable', semantic_signature: tool_name },
            metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'error' } }
        }
      },
    }

    const executor = executors[tool_name]
    if (executor) return executor
    // Fallback for unknown tools
    return async (call: any) => ({
      call_id: call.call_id,
      tool_name,
      type: 'text',
      output: { message: `Tool ${tool_name} not yet implemented` },
      metadata: { timestamp: new Date().toISOString(), call_id: call.call_id, tool_name, type: 'ok' }
    })
  }
}

export function register_builtin_tools(registry: ToolRegistry, project_root: string): BuiltInToolRegistrar {
  const registrar = new BuiltInToolRegistrar(registry)
  registrar.register_all(project_root)
  return registrar
}