/**
 * Gogs API Client
 * Provides methods to interact with a Gogs server REST API
 */

import axios, { AxiosInstance } from 'axios';
import type {
  GogsUser,
  GogsRepository,
  GogsSearchResponse,
  GogsFileContent,
  GogsBranch,
  GogsCommit,
  GogsConfig,
  GogsIssue,
  GogsIssueComment,
  GogsLabel,
  GogsMilestone,
  GogsOrganization,
  GogsTeam,
  GogsTree,
  GogsRelease,
  GogsCollaborator,
  GogsEmail,
  GogsPublicKey,
  GogsWebhook,
  GogsWebhookEvent,
  GogsWebhookType,
  GogsWebhookConfig,
  GogsFollower,
} from './types.js';

export class GogsClient {
  private client: AxiosInstance;
  private serverUrl: string;

  constructor(config: GogsConfig) {
    this.serverUrl = config.serverUrl.replace(/\/$/, '');

    this.client = axios.create({
      baseURL: `${this.serverUrl}/api/v1`,
      headers: {
        'Content-Type': 'application/json',
        ...(config.accessToken && { Authorization: `token ${config.accessToken}` }),
      },
    });
  }

  /**
   * Get information about the authenticated user
   */
  async getCurrentUser(): Promise<GogsUser> {
    const response = await this.client.get<GogsUser>('/user');
    return response.data;
  }

  /**
   * Get information about a specific user
   */
  async getUser(username: string): Promise<GogsUser> {
    const response = await this.client.get<GogsUser>(`/users/${username}`);
    return response.data;
  }

  /**
   * Search for users
   */
  async searchUsers(query: string, limit: number = 10): Promise<GogsUser[]> {
    const response = await this.client.get<GogsSearchResponse<GogsUser>>('/users/search', {
      params: { q: query, limit },
    });
    return response.data.data;
  }

  /**
   * List repositories for the authenticated user
   */
  async listMyRepositories(): Promise<GogsRepository[]> {
    const response = await this.client.get<GogsRepository[]>('/user/repos');
    return response.data;
  }

  /**
   * List repositories for a specific user
   */
  async listUserRepositories(username: string): Promise<GogsRepository[]> {
    const response = await this.client.get<GogsRepository[]>(`/users/${username}/repos`);
    return response.data;
  }

  /**
   * Search for repositories
   */
  async searchRepositories(
    query: string,
    options?: { uid?: number; limit?: number; page?: number }
  ): Promise<GogsRepository[]> {
    const response = await this.client.get<GogsSearchResponse<GogsRepository>>('/repos/search', {
      params: {
        q: query,
        uid: options?.uid || 0,
        limit: options?.limit || 10,
        page: options?.page || 1,
      },
    });
    return response.data.data;
  }

  /**
   * Get information about a specific repository
   */
  async getRepository(owner: string, repo: string): Promise<GogsRepository> {
    const response = await this.client.get<GogsRepository>(`/repos/${owner}/${repo}`);
    return response.data;
  }

  /**
   * Create a new repository
   */
  async createRepository(data: {
    name: string;
    description?: string;
    private?: boolean;
    auto_init?: boolean;
    gitignores?: string;
    license?: string;
    readme?: string;
  }): Promise<GogsRepository> {
    const response = await this.client.post<GogsRepository>('/user/repos', data);
    return response.data;
  }

  /**
   * Delete a repository
   */
  async deleteRepository(owner: string, repo: string): Promise<void> {
    await this.client.delete(`/repos/${owner}/${repo}`);
  }

  /**
   * Get file or directory contents
   */
  async getContents(
    owner: string,
    repo: string,
    path: string,
    ref?: string
  ): Promise<GogsFileContent | GogsFileContent[]> {
    const response = await this.client.get<GogsFileContent | GogsFileContent[]>(
      `/repos/${owner}/${repo}/contents/${path}`,
      {
        params: ref ? { ref } : undefined,
      }
    );
    return response.data;
  }

  /**
   * Get raw file content
   */
  async getRawContent(owner: string, repo: string, ref: string, path: string): Promise<string> {
    const response = await this.client.get<string>(
      `/repos/${owner}/${repo}/raw/${ref}/${path}`,
      {
        responseType: 'text',
      }
    );
    return response.data;
  }

  /**
   * List branches in a repository
   */
  async listBranches(owner: string, repo: string): Promise<GogsBranch[]> {
    const response = await this.client.get<GogsBranch[]>(`/repos/${owner}/${repo}/branches`);
    return response.data;
  }

  /**
   * Get commits from a repository
   */
  async getCommits(
    owner: string,
    repo: string,
    options?: { sha?: string; page?: number }
  ): Promise<GogsCommit[]> {
    const response = await this.client.get<GogsCommit[]>(`/repos/${owner}/${repo}/commits`, {
      params: {
        sha: options?.sha,
        page: options?.page || 1,
      },
    });
    return response.data;
  }

  /**
   * Get a git tree by SHA
   */
  async getTree(owner: string, repo: string, sha: string): Promise<GogsTree> {
    const response = await this.client.get<GogsTree>(`/repos/${owner}/${repo}/git/trees/${sha}`);
    return response.data;
  }

  /**
   * List issues in a repository
   */
  async listIssues(
    owner: string,
    repo: string,
    options?: {
      state?: 'open' | 'closed' | 'all';
      labels?: string;
      page?: number;
      per_page?: number;
    }
  ): Promise<GogsIssue[]> {
    const response = await this.client.get<GogsIssue[]>(`/repos/${owner}/${repo}/issues`, {
      params: {
        state: options?.state || 'open',
        labels: options?.labels,
        page: options?.page || 1,
        per_page: options?.per_page || 30,
      },
    });
    return response.data;
  }

  /**
   * Get a specific issue
   */
  async getIssue(owner: string, repo: string, number: number): Promise<GogsIssue> {
    const response = await this.client.get<GogsIssue>(`/repos/${owner}/${repo}/issues/${number}`);
    return response.data;
  }

  /**
   * Create a new issue
   */
  async createIssue(
    owner: string,
    repo: string,
    data: {
      title: string;
      body?: string;
      assignee?: string;
      milestone?: number;
      labels?: number[];
    }
  ): Promise<GogsIssue> {
    const response = await this.client.post<GogsIssue>(
      `/repos/${owner}/${repo}/issues`,
      data
    );
    return response.data;
  }

  /**
   * Update an existing issue
   */
  async updateIssue(
    owner: string,
    repo: string,
    number: number,
    data: {
      title?: string;
      body?: string;
      assignee?: string;
      milestone?: number;
      state?: 'open' | 'closed';
      labels?: number[];
    }
  ): Promise<GogsIssue> {
    const response = await this.client.patch<GogsIssue>(
      `/repos/${owner}/${repo}/issues/${number}`,
      data
    );
    return response.data;
  }

  /**
   * List comments on an issue
   */
  async listIssueComments(
    owner: string,
    repo: string,
    number: number
  ): Promise<GogsIssueComment[]> {
    const response = await this.client.get<GogsIssueComment[]>(
      `/repos/${owner}/${repo}/issues/${number}/comments`
    );
    return response.data;
  }

  /**
   * Create a comment on an issue
   */
  async createIssueComment(
    owner: string,
    repo: string,
    number: number,
    body: string
  ): Promise<GogsIssueComment> {
    const response = await this.client.post<GogsIssueComment>(
      `/repos/${owner}/${repo}/issues/${number}/comments`,
      { body }
    );
    return response.data;
  }

  /**
   * Edit a comment on an issue
   */
  async updateIssueComment(
    owner: string,
    repo: string,
    commentId: number,
    body: string
  ): Promise<GogsIssueComment> {
    const response = await this.client.patch<GogsIssueComment>(
      `/repos/${owner}/${repo}/issues/comments/${commentId}`,
      { body }
    );
    return response.data;
  }

  /**
   * List all labels in a repository
   */
  async listLabels(owner: string, repo: string): Promise<GogsLabel[]> {
    const response = await this.client.get<GogsLabel[]>(`/repos/${owner}/${repo}/labels`);
    return response.data;
  }

  /**
   * Get a specific label by ID
   */
  async getLabel(owner: string, repo: string, labelId: number): Promise<GogsLabel> {
    const response = await this.client.get<GogsLabel>(`/repos/${owner}/${repo}/labels/${labelId}`);
    return response.data;
  }

  /**
   * Create a new label
   */
  async createLabel(
    owner: string,
    repo: string,
    data: {
      name: string;
      color: string;
    }
  ): Promise<GogsLabel> {
    const response = await this.client.post<GogsLabel>(
      `/repos/${owner}/${repo}/labels`,
      data
    );
    return response.data;
  }

  /**
   * Update an existing label
   */
  async updateLabel(
    owner: string,
    repo: string,
    labelId: number,
    data: {
      name?: string;
      color?: string;
    }
  ): Promise<GogsLabel> {
    const response = await this.client.patch<GogsLabel>(
      `/repos/${owner}/${repo}/labels/${labelId}`,
      data
    );
    return response.data;
  }

  /**
   * Delete a label
   */
  async deleteLabel(owner: string, repo: string, labelId: number): Promise<void> {
    await this.client.delete(`/repos/${owner}/${repo}/labels/${labelId}`);
  }

  /**
   * List labels on a specific issue
   */
  async listIssueLabels(owner: string, repo: string, issueNumber: number): Promise<GogsLabel[]> {
    const response = await this.client.get<GogsLabel[]>(
      `/repos/${owner}/${repo}/issues/${issueNumber}/labels`
    );
    return response.data;
  }

  /**
   * Add labels to an issue
   */
  async addIssueLabels(
    owner: string,
    repo: string,
    issueNumber: number,
    labelIds: number[]
  ): Promise<GogsLabel[]> {
    const response = await this.client.post<GogsLabel[]>(
      `/repos/${owner}/${repo}/issues/${issueNumber}/labels`,
      { labels: labelIds }
    );
    return response.data;
  }

  /**
   * Remove a label from an issue
   */
  async removeIssueLabel(
    owner: string,
    repo: string,
    issueNumber: number,
    labelId: number
  ): Promise<void> {
    await this.client.delete(`/repos/${owner}/${repo}/issues/${issueNumber}/labels/${labelId}`);
  }

  /**
   * Replace all labels on an issue
   */
  async replaceIssueLabels(
    owner: string,
    repo: string,
    issueNumber: number,
    labelIds: number[]
  ): Promise<GogsLabel[]> {
    const response = await this.client.put<GogsLabel[]>(
      `/repos/${owner}/${repo}/issues/${issueNumber}/labels`,
      { labels: labelIds }
    );
    return response.data;
  }

  /**
   * Remove all labels from an issue
   */
  async removeAllIssueLabels(
    owner: string,
    repo: string,
    issueNumber: number
  ): Promise<void> {
    await this.client.delete(`/repos/${owner}/${repo}/issues/${issueNumber}/labels`);
  }

  /**
   * List all milestones in a repository
   */
  async listMilestones(owner: string, repo: string): Promise<GogsMilestone[]> {
    const response = await this.client.get<GogsMilestone[]>(`/repos/${owner}/${repo}/milestones`);
    return response.data;
  }

  /**
   * Get a specific milestone by ID
   */
  async getMilestone(owner: string, repo: string, milestoneId: number): Promise<GogsMilestone> {
    const response = await this.client.get<GogsMilestone>(`/repos/${owner}/${repo}/milestones/${milestoneId}`);
    return response.data;
  }

  /**
   * Create a new milestone
   */
  async createMilestone(
    owner: string,
    repo: string,
    data: {
      title: string;
      description?: string;
      due_on?: string;
    }
  ): Promise<GogsMilestone> {
    const response = await this.client.post<GogsMilestone>(
      `/repos/${owner}/${repo}/milestones`,
      data
    );
    return response.data;
  }

  /**
   * Update an existing milestone
   */
  async updateMilestone(
    owner: string,
    repo: string,
    milestoneId: number,
    data: {
      title?: string;
      description?: string;
      due_on?: string;
      state?: 'open' | 'closed';
    }
  ): Promise<GogsMilestone> {
    const response = await this.client.patch<GogsMilestone>(
      `/repos/${owner}/${repo}/milestones/${milestoneId}`,
      data
    );
    return response.data;
  }

  /**
   * Delete a milestone
   */
  async deleteMilestone(owner: string, repo: string, milestoneId: number): Promise<void> {
    await this.client.delete(`/repos/${owner}/${repo}/milestones/${milestoneId}`);
  }

  /**
   * List organizations for the authenticated user
   */
  async listUserOrganizations(): Promise<GogsOrganization[]> {
    const response = await this.client.get<GogsOrganization[]>('/user/orgs');
    return response.data;
  }

  /**
   * Create a new organization
   */
  async createOrganization(data: {
    username: string;
    full_name?: string;
    description?: string;
    website?: string;
    location?: string;
  }): Promise<GogsOrganization> {
    const response = await this.client.post<GogsOrganization>('/user/orgs', data);
    return response.data;
  }

  /**
   * List public organizations for a specific user
   */
  async listPublicOrganizations(username: string): Promise<GogsOrganization[]> {
    const response = await this.client.get<GogsOrganization[]>(`/users/${username}/orgs`);
    return response.data;
  }

  /**
   * Get information about a specific organization
   */
  async getOrganization(orgname: string): Promise<GogsOrganization> {
    const response = await this.client.get<GogsOrganization>(`/orgs/${orgname}`);
    return response.data;
  }

  /**
   * Update an organization
   */
  async updateOrganization(
    orgname: string,
    data: {
      full_name?: string;
      description?: string;
      website?: string;
      location?: string;
    }
  ): Promise<GogsOrganization> {
    const response = await this.client.patch<GogsOrganization>(`/orgs/${orgname}`, data);
    return response.data;
  }

  /**
   * Add or update organization membership
   */
  async addOrganizationMember(
    orgname: string,
    username: string,
    role: 'admin' | 'member'
  ): Promise<void> {
    await this.client.put(`/orgs/${orgname}/memberships/${username}`, { role });
  }

  /**
   * List teams in an organization
   */
  async listOrganizationTeams(orgname: string): Promise<GogsTeam[]> {
    const response = await this.client.get<GogsTeam[]>(`/orgs/${orgname}/teams`);
    return response.data;
  }

  /**
   * Create a new team in an organization
   */
  async createTeam(
    orgname: string,
    data: {
      name: string;
      description?: string;
      permission?: 'read' | 'write' | 'admin';
    }
  ): Promise<GogsTeam> {
    const response = await this.client.post<GogsTeam>(
      `/admin/orgs/${orgname}/teams`,
      data
    );
    return response.data;
  }

  /**
   * Get a specific team by ID
   */
  async getTeam(teamId: number): Promise<GogsTeam> {
    const response = await this.client.get<GogsTeam>(`/teams/${teamId}`);
    return response.data;
  }

  /**
   * Add a user to a team
   */
  async addTeamMember(teamId: number, username: string): Promise<void> {
    await this.client.put(`/admin/teams/${teamId}/members/${username}`);
  }

  /**
   * Remove a user from a team
   */
  async removeTeamMember(teamId: number, username: string): Promise<void> {
    await this.client.delete(`/admin/teams/${teamId}/members/${username}`);
  }

  /**
   * List releases for a repository
   */
  async listReleases(owner: string, repo: string): Promise<GogsRelease[]> {
    const response = await this.client.get<GogsRelease[]>(`/repos/${owner}/${repo}/releases`);
    return response.data;
  }

  /**
   * List collaborators for a repository
   */
  async listCollaborators(owner: string, repo: string): Promise<GogsCollaborator[]> {
    const response = await this.client.get<GogsCollaborator[]>(
      `/repos/${owner}/${repo}/collaborators`
    );
    return response.data;
  }

  /**
   * Check if a user is a collaborator
   */
  async checkCollaborator(owner: string, repo: string, username: string): Promise<boolean> {
    try {
      await this.client.get(`/repos/${owner}/${repo}/collaborators/${username}`);
      return true;
    } catch (error) {
      if (axios.isAxiosError(error) && error.response?.status === 404) {
        return false;
      }
      throw error;
    }
  }

  /**
   * Add a collaborator to a repository
   */
  async addCollaborator(
    owner: string,
    repo: string,
    username: string,
    permission?: 'read' | 'write' | 'admin'
  ): Promise<void> {
    await this.client.put(`/repos/${owner}/${repo}/collaborators/${username}`, {
      permission: permission || 'write',
    });
  }

  /**
   * Remove a collaborator from a repository
   */
  async removeCollaborator(owner: string, repo: string, username: string): Promise<void> {
    await this.client.delete(`/repos/${owner}/${repo}/collaborators/${username}`);
  }

  /**
   * List email addresses for the authenticated user
   */
  async listUserEmails(): Promise<GogsEmail[]> {
    const response = await this.client.get<GogsEmail[]>('/user/emails');
    return response.data;
  }

  /**
   * Add email address(es) to the authenticated user's account
   */
  async addUserEmails(emails: string[]): Promise<GogsEmail[]> {
    const response = await this.client.post<GogsEmail[]>('/user/emails', { emails });
    return response.data;
  }

  /**
   * Delete email address(es) from the authenticated user's account
   */
  async deleteUserEmails(emails: string[]): Promise<void> {
    await this.client.delete('/user/emails', { data: { emails } });
  }

  /**
   * List public keys for a specific user
   */
  async listUserKeys(username: string): Promise<GogsPublicKey[]> {
    const response = await this.client.get<GogsPublicKey[]>(`/users/${username}/keys`);
    return response.data;
  }

  /**
   * List public keys for the authenticated user
   */
  async listMyKeys(): Promise<GogsPublicKey[]> {
    const response = await this.client.get<GogsPublicKey[]>('/user/keys');
    return response.data;
  }

  /**
   * Get a single public key by ID
   */
  async getPublicKey(keyId: number): Promise<GogsPublicKey> {
    const response = await this.client.get<GogsPublicKey>(`/user/keys/${keyId}`);
    return response.data;
  }

  /**
   * Create a new public key for the authenticated user
   */
  async createPublicKey(data: {
    title: string;
    key: string;
  }): Promise<GogsPublicKey> {
    const response = await this.client.post<GogsPublicKey>('/user/keys', data);
    return response.data;
  }

  /**
   * Delete a public key by ID
   */
  async deletePublicKey(keyId: number): Promise<void> {
    await this.client.delete(`/user/keys/${keyId}`);
  }

  /**
   * List webhooks for a repository
   */
  async listHooks(owner: string, repo: string): Promise<GogsWebhook[]> {
    const response = await this.client.get<GogsWebhook[]>(`/repos/${owner}/${repo}/hooks`);
    return response.data;
  }

  /**
   * Create a new webhook for a repository
   */
  async createHook(
    owner: string,
    repo: string,
    data: {
      type: GogsWebhookType;
      config: GogsWebhookConfig;
      events?: GogsWebhookEvent[];
      active?: boolean;
    }
  ): Promise<GogsWebhook> {
    const response = await this.client.post<GogsWebhook>(
      `/repos/${owner}/${repo}/hooks`,
      data
    );
    return response.data;
  }

  /**
   * Update an existing webhook
   */
  async updateHook(
    owner: string,
    repo: string,
    hookId: number,
    data: {
      config: GogsWebhookConfig;
      events?: GogsWebhookEvent[];
      active?: boolean;
    }
  ): Promise<GogsWebhook> {
    const response = await this.client.patch<GogsWebhook>(
      `/repos/${owner}/${repo}/hooks/${hookId}`,
      data
    );
    return response.data;
  }

  /**
   * Delete a webhook from a repository
   */
  async deleteHook(owner: string, repo: string, hookId: number): Promise<void> {
    await this.client.delete(`/repos/${owner}/${repo}/hooks/${hookId}`);
  }

  /**
   * List followers of a user
   */
  async listFollowers(username: string): Promise<GogsFollower[]> {
    const response = await this.client.get<GogsFollower[]>(`/users/${username}/followers`);
    return response.data;
  }

  /**
   * List users that a user is following
   */
  async listFollowing(username: string): Promise<GogsFollower[]> {
    const response = await this.client.get<GogsFollower[]>(`/users/${username}/following`);
    return response.data;
  }

  /**
   * Check if the authenticated user is following a target user
   */
  async checkFollowing(username: string): Promise<boolean> {
    try {
      await this.client.get(`/user/following/${username}`);
      return true;
    } catch (error) {
      if (axios.isAxiosError(error) && error.response?.status === 404) {
        return false;
      }
      throw error;
    }
  }

  /**
   * Follow a user (authenticated user follows the target user)
   */
  async followUser(username: string): Promise<void> {
    await this.client.put(`/user/following/${username}`);
  }

  /**
   * Unfollow a user (authenticated user unfollows the target user)
   */
  async unfollowUser(username: string): Promise<void> {
    await this.client.delete(`/user/following/${username}`);
  }
}