/**
 * @fileoverview Bridges the legacy per-mode spawn options (`buildSpawnCommand`'s option bag
 * in tmux-manager.ts, unchanged on the wire since before this registry existed) onto the CLI
 * registry's generic argv engine (`renderLaunch`).
 *
 * The per-mode `<Mode>Config` objects on `POST /api/sessions` predate the registry and stay
 * on the wire for API compatibility (`docs/versioning-policy.md`), so SOMETHING has to know
 * which field holds which CLI's config. That knowledge is DATA — `launch.legacyConfigField`
 * and `launch.legacyConfigAliases`, declared once per entry in `config/cli-registry/stock.ts`
 * — which is what lets this file stay a generic reader rather than a `switch (mode)`.
 *
 * An entry declaring NO `legacyConfigField` reads its params straight off the top-level
 * option bag. That is claude, whose discrete `claudeMode`/`allowedTools`/`model`/
 * `resumeSessionId` fields predate the `<Mode>Config` pattern — not a special case for
 * claude, just the other of the two shapes the wire has always had.
 *
 * @module session-cli-registry-bridge
 */

import { getDiscordStartupHint } from './discord-bridge.js';
import type { CliEntry } from './config/cli-registry/types.js';
import { renderLaunch, type EngineValues, type ParamValues } from './config/cli-registry/argv.js';
import { matchesPattern } from './config/cli-registry/patterns.js';
import { buildAdvisorSettings, buildEffortCliArgs, sanitizeCliSessionName } from './session-cli-builder.js';
import { compareVersions } from './utils/dependency-checker.js';
import { resolveSessionCliVersion } from './utils/cli-resolver.js';
import { launcherDefaultTarget } from './utils/cli-launcher.js';
import { getCli } from './config/cli-registry/registry.js';
import type {
  AntigravityConfig,
  ClaudeMode,
  CodexConfig,
  DeepSeekConfig,
  EffortLevel,
  GeminiConfig,
  GrokConfig,
  CopilotConfig,
  OmpConfig,
  OpenCodeConfig,
  PiConfig,
} from './types/session.js';

export interface SpawnBridgeOptions {
  mode: string;
  sessionId: string;
  model?: string;
  claudeMode?: ClaudeMode;
  allowedTools?: string;
  openCodeConfig?: OpenCodeConfig;
  codexConfig?: CodexConfig;
  geminiConfig?: GeminiConfig;
  antigravityConfig?: AntigravityConfig;
  piConfig?: PiConfig;
  grokConfig?: GrokConfig;
  copilotConfig?: CopilotConfig;
  deepSeekConfig?: DeepSeekConfig;
  ompConfig?: OmpConfig;
  resumeSessionId?: string;
  effort?: EffortLevel;
  /** Claude advisor model; rides the same `--settings` JSON as ultracode (see buildAdvisorSettings). */
  advisorModel?: string;
  sessionName?: string;
  claudeCliVersion?: string | null;
  /**
   * Resolved by resolveStatusLineCliCommand (hooks-config.ts) — undefined skips the
   * exporter. Claude only. Rides the SAME `--settings` JSON object as `effortSettingsJson`
   * (see buildSpawnCommandFromRegistry): Claude Code accepts only one `--settings` flag
   * per invocation, so the two must be merged before reaching the argv engine rather than
   * rendered as two independent params.
   */
  statusLineCommand?: string;
  /**
   * Add `idleCompaction: false` to the same `--settings` JSON: Codeman's prompt-cache keep-warm
   * owns the idle policy for this launch. Decided (keep-warm on, exporter injected, version gate
   * passed) by TmuxManager._resolveIdleCompactionOptOut, which records it on the mux record.
   */
  idleCompactionOff?: boolean;
}

/**
 * The raw legacy config object this entry's params should be read from: the declared
 * `<Mode>Config` field, or the option bag itself when none is declared.
 */
function legacyConfigFor(entry: CliEntry, options: SpawnBridgeOptions): Record<string, unknown> | undefined {
  const field = entry.launch.legacyConfigField;
  if (field === undefined) return options as unknown as Record<string, unknown>;
  return (options as unknown as Record<string, unknown>)[field] as Record<string, unknown> | undefined;
}

/**
 * Same lookup, addressed by mode rather than by entry, for callers holding only a mode and an
 * option bag (tmux-manager's env configuration). Returns undefined for an unregistered mode.
 */
export function legacyConfigForMode(
  mode: string,
  options: Record<string, unknown>
): Record<string, unknown> | undefined {
  const entry = getCli(mode);
  if (!entry) return undefined;
  return legacyConfigFor(entry, options as unknown as SpawnBridgeOptions);
}

/**
 * Build `ParamValues` for every declared `token`/`bool`/`enum` param by reading it out of the
 * legacy config object through `legacyConfigAliases` (falling back to the param's own name).
 * `engine`-sourced params are skipped — those come from `EngineValues`, never legacy config.
 */
function buildParamsFromLegacyConfig(entry: CliEntry, rawConfig: Record<string, unknown> | undefined): ParamValues {
  const params: ParamValues = {};
  if (!rawConfig) return params;
  const aliases = entry.launch.legacyConfigAliases ?? {};
  for (const [paramName, spec] of Object.entries(entry.launch.params)) {
    if (spec.type === 'engine') continue;
    const legacyKey = aliases[paramName] ?? paramName;
    const value = rawConfig[legacyKey];
    if (value === undefined) continue;
    // Anything that is not already a string or boolean is DROPPED rather than coerced: the
    // wire shape is Zod-validated upstream, so a surprise here means something is wrong,
    // and `String({})` would happily produce a token nobody intended.
    if (typeof value === 'string' || typeof value === 'boolean') {
      params[paramName] = value;
    }
  }
  return params;
}

/**
 * The env vars this CLI declares in `env.configSetenv`, resolved from its legacy config
 * object — i.e. the ones whose value comes from the CALLER rather than the server's own
 * environment.
 *
 * ⚠️ Re-validated here against the declared `ParamSpec` even though the wire shape is already
 * Zod-checked upstream. These values reach `tmux setenv`, and for DeepSeek the value IS a
 * permission level: a builder must never trust its caller on a security-relevant field, and
 * the cost of re-checking an enum is nothing.
 *
 * A value that fails validation is DROPPED, not defaulted — which is the safe direction: the
 * var goes unset, and the CLI falls back to its own default (for dsh, `workspace-write`,
 * which asks) rather than to something we guessed.
 */
export function configSetenvValues(
  entry: CliEntry,
  rawConfig: Record<string, unknown> | undefined
): Record<string, string> {
  const out: Record<string, string> = {};
  const mappings = entry.env.configSetenv;
  if (!mappings || !rawConfig) return out;
  const aliases = entry.launch.legacyConfigAliases ?? {};
  for (const { name, fromParam } of mappings) {
    const spec = entry.launch.params[fromParam];
    if (!spec) continue; // schema-validated at load; belt and braces
    const raw = rawConfig[aliases[fromParam] ?? fromParam];
    if (typeof raw !== 'string') continue;
    if (spec.type === 'enum' && !spec.values.includes(raw)) continue;
    if (spec.type === 'token' && !matchesPattern(spec.pattern, raw)) continue;
    out[name] = raw;
  }
  return out;
}

/**
 * Which `capabilities.gates` are currently satisfied. `resolveVersion` is called AT MOST
 * ONCE, and only when the entry actually declares a gate — a `--version` subprocess probe
 * has no reason to run for an entry with none.
 */
function resolveGatesPassed(entry: CliEntry, resolveVersion: () => string | null): Set<string> {
  const passed = new Set<string>();
  const gateEntries = Object.entries(entry.capabilities.gates);
  if (gateEntries.length === 0) return passed;
  const cliVersion = resolveVersion();
  if (!cliVersion) return passed; // fail-closed: an unknown version satisfies no gate
  for (const [name, gate] of gateEntries) {
    if (compareVersions(cliVersion, gate.minVersion) >= 0) passed.add(name);
  }
  return passed;
}

/**
 * Whether `mode`'s `capabilities.gates[gate]` passes, through the same fail-closed resolution
 * the launch template uses (an unknown version passes no gate). For a launch-time decision that
 * is also recorded, like the `idleCompaction` opt-out. `claudeCliVersion` as in
 * SpawnBridgeOptions: undefined probes the local CLI, null means unknown.
 */
export function launchGatePasses(mode: string, gate: string, claudeCliVersion?: string | null): boolean {
  const entry = getCli(mode);
  if (!entry?.capabilities.gates[gate]) return false;
  return resolveGatesPassed(entry, () => gateVersion(entry, claudeCliVersion)).has(gate);
}

/**
 * The version a gate of `entry` is measured against: the caller's explicit value (tests, or
 * null for "known unknown"), else THIS entry's own local CLI via resolveSessionCliVersion.
 * ⚠️ Never `getClaudeCliVersion()` for every entry, which is what this used to do: codex's
 * `noDaemonFlag` gate (0.162.0) would then have passed on any claude 2.x and handed an older
 * codex a flag it exits on. resolveSessionCliVersion still routes claude to its own probe
 * policy (`retryOnTransientFailure`), so a claude launch is unchanged.
 */
function gateVersion(entry: CliEntry, explicit: string | null | undefined): string | null {
  return explicit !== undefined ? explicit : resolveSessionCliVersion(entry.id);
}

/**
 * Render the spawn command for `entry` from the legacy option bag. Returns `undefined` for a
 * `shell`-kind entry (or any entry declaring no launch variants), which callers take as "fall
 * back to the local login-shell resolution" — shell has no CLI to template.
 */
export function buildSpawnCommandFromRegistry(entry: CliEntry, options: SpawnBridgeOptions): string | undefined {
  if (entry.kind === 'shell' || entry.launch.variants.length === 0) return undefined;

  const params = buildParamsFromLegacyConfig(entry, legacyConfigFor(entry, options));

  const engineValues: EngineValues = {
    sessionId: options.sessionId,
    // Allowlist-sanitized (Unicode letters/digits + ` . _ : -`, 64 chars), matching
    // buildNameCliArgs exactly — sanitizeCliSessionName is the injection guard for this
    // value, NOT the `quote: 'double'` escaping on the --name arg (which only makes an
    // unsafe value inert, it does not launder one into something meaningful).
    sessionName: sanitizeCliSessionName(options.sessionName),
  };

  // Only a launcher CLI has one, and resolving it means a filesystem scan of the launcher's
  // profile tree, so skip the lookup entirely for the eight entries that declare no profile.
  if (entry.discovery.launcherProfile !== undefined) {
    engineValues.launcherDefaultTarget = launcherDefaultTarget(entry) ?? undefined;
  }

  // Mirrors buildEffortCliArgs exactly: ultracode carries a fixed settings blob, every other
  // level rides a plain `--effort <level>` flag. Reusing the canonical builder here (rather
  // than re-deriving the ultracode special case) keeps the EFFORT_LEVELS allowlist and the
  // settings-JSON shape single-sourced in session-cli-builder.ts.
  const [effortFlag, effortValue] = buildEffortCliArgs(options.effort);
  if (effortFlag === '--effort') {
    engineValues.effortLevel = effortValue;
  }

  // Fold the advisor model and the ephemeral plan-usage statusLine exporter (see
  // resolveStatusLineCliCommand in hooks-config.ts) into the SAME `--settings` JSON object as
  // ultracode/ effort, since Claude Code accepts only one `--settings` flag per invocation:
  // rendering them as independent params would let the last one silently win. Claude-only in
  // practice: only claude's launch template renders this engine value, so another CLI's
  // session carrying an advisorModel launches exactly as before.
  // Key order (ultracode, advisorModel, statusLine, idleCompaction) keeps a launch without an
  // advisor or keep-warm byte-identical to one from before either existed.
  const advisorSettings = buildAdvisorSettings(options.advisorModel);
  if (
    (effortFlag === '--settings' && effortValue) ||
    advisorSettings.advisorModel ||
    options.statusLineCommand ||
    options.idleCompactionOff
  ) {
    const settingsObj: Record<string, unknown> = {
      ...(effortFlag === '--settings' && effortValue ? JSON.parse(effortValue) : {}),
      ...advisorSettings,
    };
    if (options.statusLineCommand) {
      settingsObj.statusLine = { type: 'command', command: options.statusLineCommand };
    }
    if (options.idleCompactionOff) settingsObj.idleCompaction = false;
    engineValues.effortSettingsJson = JSON.stringify(settingsObj);
  }

  // The Discord bridge's startup hint: undefined (so the flag is omitted) unless the bridge and its
  // `startupHint` setting are on. Claude-only in practice, like the settings object above.
  engineValues.appendSystemPrompt = getDiscordStartupHint();

  // Preserves buildSpawnCommand's original fallback: an EXPLICIT `undefined` probes the
  // entry's own local CLI (gateVersion: claude's probe for claude, the registry resolver for
  // the rest, both null under vitest); an explicit `null` means "known to be unresolvable"
  // and must not probe. The probe only ever runs from resolveGatesPassed, and only for an
  // entry that actually declares a gate, so a CLI with none never spawns a `--version`.
  const gatesPassed = resolveGatesPassed(entry, () => gateVersion(entry, options.claudeCliVersion));

  return renderLaunch(entry.launch, params, engineValues, gatesPassed);
}