/**
 * Config-get and resolve-model query handlers.
 *
 * Ported from get-shit-done/bin/lib/config.cjs and commands.cjs.
 * Provides raw config.json traversal and model profile resolution.
 *
 * @example
 * ```typescript
 * import { configGet, resolveModel } from './config-query.js';
 *
 * const result = await configGet(['workflow.auto_advance'], '/project');
 * // { data: true }
 *
 * const model = await resolveModel(['gsd-planner'], '/project');
 * // { data: { model: 'opus', profile: 'balanced' } }
 * ```
 */

import { readFile } from 'node:fs/promises';
import { GSDError, ErrorClassification } from '../errors.js';
import { loadConfig } from '../config.js';
import { planningPaths } from './helpers.js';
import type { QueryHandler } from './utils.js';

// ─── MODEL_PROFILES ─────────────────────────────────────────────────────────

/**
 * Mapping of GSD agent type to model alias for each profile tier.
 *
 * Ported from get-shit-done/bin/lib/model-profiles.cjs.
 */
export const MODEL_PROFILES: Record<string, Record<string, string>> = {
  'gsd-planner': { quality: 'opus', balanced: 'opus', budget: 'sonnet', adaptive: 'opus' },
  'gsd-roadmapper': { quality: 'opus', balanced: 'sonnet', budget: 'sonnet', adaptive: 'sonnet' },
  'gsd-executor': { quality: 'opus', balanced: 'sonnet', budget: 'sonnet', adaptive: 'sonnet' },
  'gsd-phase-researcher': { quality: 'opus', balanced: 'sonnet', budget: 'haiku', adaptive: 'sonnet' },
  'gsd-project-researcher': { quality: 'opus', balanced: 'sonnet', budget: 'haiku', adaptive: 'sonnet' },
  'gsd-research-synthesizer': { quality: 'sonnet', balanced: 'sonnet', budget: 'haiku', adaptive: 'haiku' },
  'gsd-debugger': { quality: 'opus', balanced: 'sonnet', budget: 'sonnet', adaptive: 'opus' },
  'gsd-codebase-mapper': { quality: 'sonnet', balanced: 'haiku', budget: 'haiku', adaptive: 'haiku' },
  'gsd-verifier': { quality: 'sonnet', balanced: 'sonnet', budget: 'haiku', adaptive: 'sonnet' },
  'gsd-plan-checker': { quality: 'sonnet', balanced: 'sonnet', budget: 'haiku', adaptive: 'haiku' },
  'gsd-integration-checker': { quality: 'sonnet', balanced: 'sonnet', budget: 'haiku', adaptive: 'haiku' },
  'gsd-nyquist-auditor': { quality: 'sonnet', balanced: 'sonnet', budget: 'haiku', adaptive: 'haiku' },
  'gsd-pattern-mapper': { quality: 'sonnet', balanced: 'sonnet', budget: 'haiku', adaptive: 'haiku' },
  'gsd-ui-researcher': { quality: 'opus', balanced: 'sonnet', budget: 'haiku', adaptive: 'sonnet' },
  'gsd-ui-checker': { quality: 'sonnet', balanced: 'sonnet', budget: 'haiku', adaptive: 'haiku' },
  'gsd-ui-auditor': { quality: 'sonnet', balanced: 'sonnet', budget: 'haiku', adaptive: 'haiku' },
  'gsd-doc-writer': { quality: 'opus', balanced: 'sonnet', budget: 'haiku', adaptive: 'sonnet' },
  'gsd-doc-verifier': { quality: 'sonnet', balanced: 'sonnet', budget: 'haiku', adaptive: 'haiku' },
};

/** Valid model profile names. */
export const VALID_PROFILES: string[] = Object.keys(MODEL_PROFILES['gsd-planner']);

/**
 * Flat map of agent name → model alias for one profile tier (matches `model-profiles.cjs`).
 */
export function getAgentToModelMapForProfile(normalizedProfile: string): Record<string, string> {
  const profile = VALID_PROFILES.includes(normalizedProfile) ? normalizedProfile : 'balanced';
  const agentToModelMap: Record<string, string> = {};
  for (const [agent, profileToModelMap] of Object.entries(MODEL_PROFILES)) {
    const mapped = profileToModelMap[profile] ?? profileToModelMap.balanced;
    agentToModelMap[agent] = mapped ?? 'sonnet';
  }
  return agentToModelMap;
}

// ─── configGet ──────────────────────────────────────────────────────────────

/**
 * Query handler for config-get command.
 *
 * Reads raw .planning/config.json and traverses dot-notation key paths.
 * Does NOT merge with defaults (matches gsd-tools.cjs behavior).
 *
 * @param args - args[0] is the dot-notation key path (e.g., 'workflow.auto_advance')
 * @param projectDir - Project root directory
 * @returns QueryResult with the config value at the given path
 * @throws GSDError with Validation classification if key missing or not found
 */
export const configGet: QueryHandler = async (args, projectDir, _workstream) => {
  const keyPath = args[0];
  if (!keyPath) {
    throw new GSDError('Usage: config-get <key.path>', ErrorClassification.Validation);
  }

  const paths = planningPaths(projectDir);
  let raw: string;
  try {
    raw = await readFile(paths.config, 'utf-8');
  } catch {
    throw new GSDError(`No config.json found at ${paths.config}`, ErrorClassification.Validation);
  }

  let config: Record<string, unknown>;
  try {
    config = JSON.parse(raw) as Record<string, unknown>;
  } catch {
    throw new GSDError(`Malformed config.json at ${paths.config}`, ErrorClassification.Validation);
  }

  const keys = keyPath.split('.');
  let current: unknown = config;
  for (const key of keys) {
    if (current === undefined || current === null || typeof current !== 'object') {
      // UNIX convention (cf. `git config --get`): missing key exits 1, not 10.
      // See issue #2544 — callers use `if ! gsd-sdk query config-get k; then` patterns.
      throw new GSDError(`Key not found: ${keyPath}`, ErrorClassification.Execution);
    }
    current = (current as Record<string, unknown>)[key];
  }
  if (current === undefined) {
    throw new GSDError(`Key not found: ${keyPath}`, ErrorClassification.Execution);
  }

  return { data: current };
};

// ─── configPath ─────────────────────────────────────────────────────────────

/**
 * Query handler for config-path — resolved `.planning/config.json` path (workstream-aware via cwd).
 *
 * Port of `cmdConfigPath` from `config.cjs`. The JSON query API returns `{ path }`; the CJS CLI
 * emits the path as plain text for shell substitution.
 *
 * @param _args - Unused
 * @param projectDir - Project root directory
 * @returns QueryResult with `{ path: string }` absolute or project-relative resolution via planningPaths
 */
export const configPath: QueryHandler = async (_args, projectDir, _workstream) => {
  const paths = planningPaths(projectDir);
  return { data: { path: paths.config } };
};

// ─── resolveModel ───────────────────────────────────────────────────────────

/**
 * Query handler for resolve-model command.
 *
 * Resolves the model alias for a given agent type based on the current profile.
 * Uses loadConfig (with defaults) and MODEL_PROFILES for lookup.
 *
 * @param args - args[0] is the agent type (e.g., 'gsd-planner')
 * @param projectDir - Project root directory
 * @returns QueryResult with { model, profile } or { model, profile, unknown_agent: true }
 * @throws GSDError with Validation classification if agent type not provided
 */
export const resolveModel: QueryHandler = async (args, projectDir) => {
  const agentType = args[0];
  if (!agentType) {
    throw new GSDError('agent-type required', ErrorClassification.Validation);
  }

  const config = await loadConfig(projectDir);
  const profile = String(config.model_profile || 'balanced').toLowerCase();

  // Check per-agent override first
  const overrides = (config as Record<string, unknown>).model_overrides as Record<string, string> | undefined;
  const override = overrides?.[agentType];
  if (override) {
    const agentModels = MODEL_PROFILES[agentType];
    const result = agentModels
      ? { model: override, profile }
      : { model: override, profile, unknown_agent: true };
    return { data: result };
  }

  // resolve_model_ids: "omit" -- return empty string
  const resolveModelIds = (config as Record<string, unknown>).resolve_model_ids;
  if (resolveModelIds === 'omit') {
    const agentModels = MODEL_PROFILES[agentType];
    const result = agentModels
      ? { model: '', profile }
      : { model: '', profile, unknown_agent: true };
    return { data: result };
  }

  // Fall back to profile lookup
  const agentModels = MODEL_PROFILES[agentType];
  if (!agentModels) {
    return { data: { model: 'sonnet', profile, unknown_agent: true } };
  }

  if (profile === 'inherit') {
    return { data: { model: 'inherit', profile } };
  }

  const alias = agentModels[profile] || agentModels['balanced'] || 'sonnet';
  return { data: { model: alias, profile } };
};