import { minimatch } from "minimatch";
import { getCurrentGitBranch, isGitRepository } from "../utils/git.ts";
import { isFileResource, isFilesetResource } from "../utils/utils.ts";
import {
  SyncOptions,
  findWorkspaceByGitBranch,
  readConfigFile,
  WorkspaceEntryConfig,
} from "./conf.ts";
import { TRIGGER_TYPES } from "../types.ts";

/**
 * Resolve the effective workspace name (wmill.yaml config key) for a given
 * git branch. Falls back to the branch name itself when no matching workspace
 * entry exists (legacy behavior).
 */
export async function resolveWsNameForGitBranch(branchName: string): Promise<string> {
  const config = await readConfigFile({ warnIfMissing: false });
  const match = findWorkspaceByGitBranch(config.workspaces, branchName);
  return match ? match[0] : branchName;
}

export interface SpecificItemsConfig {
  variables?: string[];
  resources?: string[];
  triggers?: string[];
  schedules?: string[];
  folders?: string[];
  settings?: boolean;
}

// Define all workspace-specific file type *kinds* (extension-less). The
// actual on-disk file is `<kind>.yaml` or `<kind>.json` depending on
// opts.json — every helper below treats both as equivalent.
function getWorkspaceSpecificTypeKinds(): string[] {
  return [
    'variable',
    'resource',
    'schedule',
    ...TRIGGER_TYPES.map(t => `${t}_trigger`),
  ];
}

/**
 * Check if a path ends with any trigger type
 */
function isTriggerFile(path: string): boolean {
  return TRIGGER_TYPES.some(type =>
    path.endsWith(`.${type}_trigger.yaml`) || path.endsWith(`.${type}_trigger.json`)
  );
}

/**
 * Check if a path is a schedule file
 */
function isScheduleFile(path: string): boolean {
  return path.endsWith('.schedule.yaml') || path.endsWith('.schedule.json');
}

/**
 * Extract the file type suffix from a path. Preserves the original `.yaml`
 * or `.json` extension so callers like toWorkspaceSpecificPath round-trip
 * correctly.
 */
function getFileTypeSuffix(path: string): string | null {
  for (const kind of getWorkspaceSpecificTypeKinds()) {
    if (path.endsWith(`.${kind}.yaml`)) return `.${kind}.yaml`;
    if (path.endsWith(`.${kind}.json`)) return `.${kind}.json`;
  }

  const resourceFileMatch = path.match(/(\.resource\.file\..+)$/);
  if (resourceFileMatch) {
    return resourceFileMatch[1];
  }

  return null;
}

/**
 * Build regex pattern for all supported item-kind file types
 */
function buildItemTypePattern(): string {
  const basicTypes = ['variable', 'resource', 'schedule'];
  const triggerTypes = TRIGGER_TYPES.map(t => `${t}_trigger`);
  return `((${basicTypes.join('|')})|(${triggerTypes.join('|')}))`;
}

/**
 * Get the specific items configuration for the current workspace.
 * workspaceNameOverride selects by workspace name (O(1)).
 * When not provided, auto-detects from the current git branch.
 * Merges commonSpecificItems with workspace-specific specificItems.
 */
export function getSpecificItemsForCurrentBranch(config: SyncOptions, workspaceNameOverride?: string): SpecificItemsConfig | undefined {
  if (!config.workspaces) {
    return undefined;
  }

  let wsEntry: WorkspaceEntryConfig | undefined;

  if (workspaceNameOverride) {
    wsEntry = config.workspaces[workspaceNameOverride] as WorkspaceEntryConfig | undefined;
  } else if (isGitRepository()) {
    const currentWorkspace = getCurrentGitBranch();
    if (currentWorkspace) {
      const match = findWorkspaceByGitBranch(config.workspaces, currentWorkspace);
      if (match) {
        wsEntry = match[1];
      }
    }
  }

  const commonItems = config.workspaces.commonSpecificItems;
  const wsItems = wsEntry?.specificItems;

  // If neither common nor workspace-specific items exist, return undefined
  if (!commonItems && !wsItems) {
    return undefined;
  }

  // Merge common and workspace-specific items
  const merged: SpecificItemsConfig = {};

  // Add common items
  if (commonItems?.variables) {
    merged.variables = [...commonItems.variables];
  }
  if (commonItems?.resources) {
    merged.resources = [...commonItems.resources];
  }
  if (commonItems?.triggers) {
    merged.triggers = [...commonItems.triggers];
  }
  if (commonItems?.schedules) {
    merged.schedules = [...commonItems.schedules];
  }
  if (commonItems?.folders) {
    merged.folders = [...commonItems.folders];
  }
  if (commonItems?.settings !== undefined) {
    merged.settings = commonItems.settings;
  }

  // Add workspace-specific items (extending common items)
  if (wsItems?.variables) {
    merged.variables = [...(merged.variables || []), ...wsItems.variables];
  }
  if (wsItems?.resources) {
    merged.resources = [...(merged.resources || []), ...wsItems.resources];
  }
  if (wsItems?.triggers) {
    merged.triggers = [...(merged.triggers || []), ...wsItems.triggers];
  }
  if (wsItems?.schedules) {
    merged.schedules = [...(merged.schedules || []), ...wsItems.schedules];
  }
  if (wsItems?.folders) {
    merged.folders = [...(merged.folders || []), ...wsItems.folders];
  }
  // For settings (boolean), workspace-specific overrides common
  if (wsItems?.settings !== undefined) {
    merged.settings = wsItems.settings;
  }

  return merged;
}

/**
 * Check if a path matches any of the patterns in the given list
 */
function matchesPatterns(path: string, patterns: string[]): boolean {
  return patterns.some(pattern => minimatch(path, pattern));
}

/**
 * Normalize a `.json` extension to `.yaml` for pattern matching. Patterns in
 * wmill.yaml (and those appended by mergeWsSpecificFromServer) are expressed
 * with `.yaml` regardless of opts.json, so a `.json` local file would never
 * match without this. The rest of `isSpecificItem`/`isItemTypeConfigured`
 * checks `endsWith('.X.yaml')`, so normalizing once at the entry point keeps
 * both the helpers and the patterns single-extension.
 */
function normalizeJsonToYaml(path: string): string {
  return path.endsWith('.json') ? path.slice(0, -'.json'.length) + '.yaml' : path;
}

/**
 * Check if the item type for a given path is configured in specificItems.
 * This checks if the TYPE is configured, not whether it matches the pattern.
 * Used to determine if workspace-specific files should be used for this type.
 */
export function isItemTypeConfigured(path: string, specificItems: SpecificItemsConfig | undefined): boolean {
  if (!specificItems) {
    return false;
  }

  path = normalizeJsonToYaml(path);

  if (path.endsWith('.variable.yaml')) {
    return specificItems.variables !== undefined;
  }

  if (path.endsWith('.resource.yaml')) {
    return specificItems.resources !== undefined;
  }

  if (isTriggerFile(path)) {
    return specificItems.triggers !== undefined;
  }

  if (isScheduleFile(path)) {
    return specificItems.schedules !== undefined;
  }

  if (path.endsWith('/folder.meta.yaml')) {
    return specificItems.folders !== undefined;
  }

  if (path === 'settings.yaml') {
    return specificItems.settings !== undefined;
  }

  if (isFileResource(path) || isFilesetResource(path)) {
    return specificItems.resources !== undefined;
  }

  return false;
}

/**
 * Check if a file path should be treated as workspace-specific
 */
export function isSpecificItem(path: string, specificItems: SpecificItemsConfig | undefined): boolean {
  if (!specificItems) {
    return false;
  }

  path = normalizeJsonToYaml(path);

  // Determine the item type from the file path
  if (path.endsWith('.variable.yaml')) {
    return specificItems.variables ? matchesPatterns(path, specificItems.variables) : false;
  }

  if (path.endsWith('.resource.yaml')) {
    return specificItems.resources ? matchesPatterns(path, specificItems.resources) : false;
  }

  // Check for any trigger type
  if (isTriggerFile(path)) {
    return specificItems.triggers ? matchesPatterns(path, specificItems.triggers) : false;
  }

  // Check for schedule files
  if (isScheduleFile(path)) {
    return specificItems.schedules ? matchesPatterns(path, specificItems.schedules) : false;
  }

  // Check for folder meta files
  if (path.endsWith('/folder.meta.yaml')) {
    if (specificItems.folders) {
      // Match against the folder path (without /folder.meta.yaml)
      const folderPath = path.slice(0, -'/folder.meta.yaml'.length);
      return matchesPatterns(folderPath, specificItems.folders);
    }
    return false;
  }

  // Check for settings.yaml (root-level file)
  if (path === 'settings.yaml') {
    return specificItems.settings === true;
  }

  // Check for resource files using the standard detection function
  if (isFileResource(path)) {
    // Extract the base path without the file extension to match against patterns
    const basePathMatch = path.match(/^(.+?)\.resource\.file\./);
    if (basePathMatch && specificItems.resources) {
      const basePath = basePathMatch[1] + '.resource.yaml';
      return matchesPatterns(basePath, specificItems.resources);
    }
  }

  if (isFilesetResource(path)) {
    const basePathMatch = path.match(/^(.+?)\.fileset[/\\]/);
    if (basePathMatch && specificItems.resources) {
      const basePath = basePathMatch[1] + '.resource.yaml';
      return matchesPatterns(basePath, specificItems.resources);
    }
  }

  return false;
}

/**
 * Convert a base path to a workspace-specific path
 */
export function toWorkspaceSpecificPath(basePath: string, workspaceName: string): string {
  // Sanitize branch name to be filesystem-safe
  const sanitizedName = workspaceName.replace(/[\/\\:*?"<>|.]/g, '_');

  // Warn about potential collisions if sanitization occurred
  if (sanitizedName !== workspaceName) {
    console.warn(`Warning: Workspace name "${workspaceName}" contains filesystem-unsafe characters (/ \\ : * ? " < > | .) and was sanitized to "${sanitizedName}". This may cause collisions with other similarly named branches.`);
  }

  // Check for folder meta file pattern: folder.meta.{yaml,json} -> folder.workspaceName.meta.{yaml,json}
  const folderMetaMatch = basePath.match(/^(.*)\/folder\.meta\.(yaml|json)$/);
  if (folderMetaMatch) {
    return `${folderMetaMatch[1]}/folder.${sanitizedName}.meta.${folderMetaMatch[2]}`;
  }

  // Check for settings.{yaml,json}: settings.{ext} -> settings.workspaceName.{ext}
  const settingsMatch = basePath.match(/^settings\.(yaml|json)$/);
  if (settingsMatch) {
    return `settings.${sanitizedName}.${settingsMatch[1]}`;
  }

  // Check for resource file pattern (e.g., .resource.file.ini)
  const resourceFileMatch = basePath.match(/^(.+?)(\.resource\.file\..+)$/);

  let extension: string;
  let pathWithoutExtension: string;

  if (resourceFileMatch) {
    // Handle resource files
    extension = resourceFileMatch[2];
    pathWithoutExtension = resourceFileMatch[1];
  } else {
    const suffix = getFileTypeSuffix(basePath);
    if (!suffix) {
      return basePath;
    }
    extension = suffix;
    pathWithoutExtension = basePath.substring(0, basePath.length - extension.length);
  }

  return `${pathWithoutExtension}.${sanitizedName}${extension}`;
}

/**
 * Convert a workspace-specific path back to a base path
 */
export function fromWorkspaceSpecificPath(workspaceSpecificPath: string, workspaceName: string): string {
  // Sanitize branch name the same way as in toWorkspaceSpecificPath
  const sanitizedName = workspaceName.replace(/[\/\\:*?"<>|.]/g, '_');
  const escapedName = sanitizedName.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');

  // Check for folder meta file pattern: /folder.workspaceName.meta.{yaml,json} -> /folder.meta.{ext}
  const folderPattern = new RegExp(`/folder\\.${escapedName}\\.meta\\.(yaml|json)$`);
  const folderMatch = workspaceSpecificPath.match(folderPattern);
  if (folderMatch) {
    return workspaceSpecificPath.replace(folderPattern, `/folder.meta.${folderMatch[1]}`);
  }

  // Check for settings file pattern: settings.workspaceName.{yaml,json} -> settings.{ext}
  const settingsPattern = new RegExp(`^settings\\.${escapedName}\\.(yaml|json)$`);
  const settingsMatch = workspaceSpecificPath.match(settingsPattern);
  if (settingsMatch) {
    return `settings.${settingsMatch[1]}`;
  }

  // Check for resource file pattern
  const resourceFilePattern = new RegExp(`\\.${escapedName}(\\.resource\\.file\\..+)$`);
  const resourceFileMatch = workspaceSpecificPath.match(resourceFilePattern);

  if (resourceFileMatch) {
    const extension = resourceFileMatch[1];
    const pathWithoutBranchAndExtension = workspaceSpecificPath.substring(
      0,
      workspaceSpecificPath.length - `.${sanitizedName}${extension}`.length
    );
    return `${pathWithoutBranchAndExtension}${extension}`;
  }

  const typedPattern = new RegExp(`\\.${escapedName}(\\.${buildItemTypePattern()}\\.(yaml|json))$`);
  const typedMatch = workspaceSpecificPath.match(typedPattern);

  if (!typedMatch) {
    return workspaceSpecificPath; // Return unchanged if not a workspace-specific path
  }

  const extension = typedMatch[1];
  const pathWithoutBranchAndExtension = workspaceSpecificPath.substring(
    0,
    workspaceSpecificPath.length - `.${sanitizedName}${extension}`.length
  );

  return `${pathWithoutBranchAndExtension}${extension}`;
}

/**
 * Get the workspace-specific path if the item should be workspace-specific.
 * workspaceNameOverride is the workspace name used as file suffix.
 * Falls back to current git branch when no override (backward compat: old key = branch name).
 */
export function getWorkspaceSpecificPath(
  basePath: string,
  specificItems: SpecificItemsConfig | undefined,
  workspaceNameOverride?: string
): string | undefined {
  if (!specificItems) {
    return undefined;
  }

  let currentWorkspace: string | null = null;
  if (workspaceNameOverride) {
    currentWorkspace = workspaceNameOverride;
  } else if (isGitRepository()) {
    currentWorkspace = getCurrentGitBranch();
  }

  if (!currentWorkspace) {
    return undefined;
  }

  if (isSpecificItem(basePath, specificItems)) {
    return toWorkspaceSpecificPath(basePath, currentWorkspace);
  }

  return undefined;
}

// Cache for compiled regex patterns to avoid recompilation
const workspacePatternCache = new Map<string, RegExp>();

/**
 * Check if a path is a workspace-specific file for the current branch.
 * workspaceNameOverride is the effective git branch name (for file naming on disk).
 */
export function isCurrentWorkspaceFile(path: string, workspaceNameOverride?: string): boolean {
  // Fileset children are never workspace-specific: only the parent's metadata
  // file carries the suffix, children stay in the shared canonical directory.
  // Their names are arbitrary, so one can look like typed metadata — and since
  // the patterns match a workspace-name segment with `[^.]` (which spans `/`),
  // an unguarded child is dropped from the diff or, worse, remapped onto a
  // sibling's key and deployed over it.
  if (isFilesetResource(path)) {
    return false;
  }
  let currentWorkspace: string | null = null;
  if (workspaceNameOverride) {
    currentWorkspace = workspaceNameOverride;
  } else if (isGitRepository()) {
    currentWorkspace = getCurrentGitBranch();
  }

  if (!currentWorkspace) {
    return false;
  }

  // Sanitize branch name to match what would be used in file naming
  const sanitizedName = currentWorkspace.replace(/[\/\\:*?"<>|.]/g, '_');
  const escapedName = sanitizedName.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');

  // Use cached pattern or create and cache new one
  let pattern = workspacePatternCache.get(currentWorkspace);
  if (!pattern) {
    pattern = new RegExp(
      `\\.${escapedName}\\.${buildItemTypePattern()}\\.(yaml|json)$|` +
      `\\.${escapedName}\\.resource\\.file\\..+$|` +
      `/folder\\.${escapedName}\\.meta\\.(yaml|json)$|` +
      `^settings\\.${escapedName}\\.(yaml|json)$`
    );
    workspacePatternCache.set(currentWorkspace, pattern);
  }

  return pattern.test(path);
}

/**
 * Check if a path is a workspace-specific file for ANY branch (not necessarily current)
 * Used to identify and skip files from other branches during sync operations
 */
export function isWorkspaceSpecificFile(path: string): boolean {
  // Same fileset exemption as isCurrentWorkspaceFile.
  if (isFilesetResource(path)) {
    return false;
  }
  const typePattern = buildItemTypePattern();
  return new RegExp(
    `\\.[^.]+\\.${typePattern}\\.(yaml|json)$|` +
    `\\.[^.]+\\.resource\\.file\\..+$|` +
    `/folder\\.[^.]+\\.meta\\.(yaml|json)$|` +
    `^settings\\.[^.]+\\.(yaml|json)$`
  ).test(path);
}