import type {
  GitBranchCompareResult,
  GitConflictOperation,
  GitDiffResult,
  GitPushTarget,
  GitStatusResult,
  GitUpstreamStatus,
  GitWorktreeInfo,
  Worktree
} from '../../shared/types'
import { getRemoteFileUrl } from '../git/repo'
import {
  bulkStageFiles,
  bulkUnstageFiles,
  commitChanges,
  detectConflictOperation,
  discardChanges,
  getBranchCompare,
  getBranchDiff,
  getDiff,
  getStatus as getGitStatus,
  stageFile,
  unstageFile
} from '../git/status'
import { getUpstreamStatus } from '../git/upstream'
import { gitFetch, gitPull, gitPush } from '../git/remote'
import { getSshGitProvider } from '../providers/ssh-git-dispatch'
import { normalizeRuntimeRelativePath } from './runtime-relative-paths'

export type ResolvedRuntimeGitWorktree = Worktree & { git: GitWorktreeInfo }

export type RuntimeGitCommandHost = {
  resolveRuntimeGitTarget(
    selector: string
  ): Promise<{ worktree: ResolvedRuntimeGitWorktree; connectionId?: string }>
}

export class RuntimeGitCommands {
  constructor(private readonly host: RuntimeGitCommandHost) {}

  async getRuntimeGitStatus(worktreeSelector: string): Promise<GitStatusResult> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      return provider.getStatus(target.worktree.path)
    }
    return getGitStatus(target.worktree.path)
  }

  async getRuntimeGitConflictOperation(worktreeSelector: string): Promise<GitConflictOperation> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      return provider.detectConflictOperation(target.worktree.path)
    }
    return detectConflictOperation(target.worktree.path)
  }

  async getRuntimeGitDiff(
    worktreeSelector: string,
    filePath: string,
    staged: boolean,
    compareAgainstHead?: boolean
  ): Promise<GitDiffResult> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const relativePath = normalizeRuntimeRelativePath(filePath)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      return provider.getDiff(target.worktree.path, relativePath, staged, compareAgainstHead)
    }
    return getDiff(target.worktree.path, relativePath, staged, compareAgainstHead)
  }

  async getRuntimeGitBranchCompare(
    worktreeSelector: string,
    baseRef: string
  ): Promise<GitBranchCompareResult> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      return provider.getBranchCompare(target.worktree.path, baseRef)
    }
    return getBranchCompare(target.worktree.path, baseRef)
  }

  async getRuntimeGitUpstreamStatus(worktreeSelector: string): Promise<GitUpstreamStatus> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      return provider.getUpstreamStatus(target.worktree.path)
    }
    return getUpstreamStatus(target.worktree.path)
  }

  async fetchRuntimeGit(worktreeSelector: string): Promise<{ ok: true }> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      await provider.fetchRemote(target.worktree.path)
      return { ok: true }
    }
    await gitFetch(target.worktree.path)
    return { ok: true }
  }

  async pullRuntimeGit(worktreeSelector: string): Promise<{ ok: true }> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      await provider.pullBranch(target.worktree.path)
      return { ok: true }
    }
    await gitPull(target.worktree.path)
    return { ok: true }
  }

  async pushRuntimeGit(
    worktreeSelector: string,
    publish?: boolean,
    pushTarget?: GitPushTarget
  ): Promise<{ ok: true }> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      await provider.pushBranch(target.worktree.path, publish === true, pushTarget)
      return { ok: true }
    }
    await gitPush(target.worktree.path, publish === true, pushTarget)
    return { ok: true }
  }

  async getRuntimeGitBranchDiff(
    worktreeSelector: string,
    compare: { mergeBase: string; headOid: string },
    filePath: string,
    oldPath?: string
  ): Promise<GitDiffResult> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const relativePath = normalizeRuntimeRelativePath(filePath)
    const oldRelativePath = oldPath ? normalizeRuntimeRelativePath(oldPath) : undefined
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      const results = await provider.getBranchDiff(target.worktree.path, compare.mergeBase, {
        includePatch: true,
        filePath: relativePath,
        oldPath: oldRelativePath
      })
      return (
        results[0] ?? {
          kind: 'text',
          originalContent: '',
          modifiedContent: '',
          originalIsBinary: false,
          modifiedIsBinary: false
        }
      )
    }
    return getBranchDiff(target.worktree.path, {
      mergeBase: compare.mergeBase,
      headOid: compare.headOid,
      filePath: relativePath,
      oldPath: oldRelativePath
    })
  }

  async commitRuntimeGit(
    worktreeSelector: string,
    message: string
  ): Promise<{ success: boolean; error?: string }> {
    if (message.trim().length === 0) {
      throw new Error('Commit message is required')
    }
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      return provider.commit(target.worktree.path, message)
    }
    return commitChanges(target.worktree.path, message)
  }

  async stageRuntimeGitPath(worktreeSelector: string, filePath: string): Promise<{ ok: true }> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const relativePath = normalizeRuntimeRelativePath(filePath)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      await provider.stageFile(target.worktree.path, relativePath)
      return { ok: true }
    }
    await stageFile(target.worktree.path, relativePath)
    return { ok: true }
  }

  async unstageRuntimeGitPath(worktreeSelector: string, filePath: string): Promise<{ ok: true }> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const relativePath = normalizeRuntimeRelativePath(filePath)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      await provider.unstageFile(target.worktree.path, relativePath)
      return { ok: true }
    }
    await unstageFile(target.worktree.path, relativePath)
    return { ok: true }
  }

  async bulkStageRuntimeGitPaths(
    worktreeSelector: string,
    filePaths: string[]
  ): Promise<{ ok: true }> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const relativePaths = filePaths.map((path) => normalizeRuntimeRelativePath(path))
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      await provider.bulkStageFiles(target.worktree.path, relativePaths)
      return { ok: true }
    }
    await bulkStageFiles(target.worktree.path, relativePaths)
    return { ok: true }
  }

  async bulkUnstageRuntimeGitPaths(
    worktreeSelector: string,
    filePaths: string[]
  ): Promise<{ ok: true }> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const relativePaths = filePaths.map((path) => normalizeRuntimeRelativePath(path))
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      await provider.bulkUnstageFiles(target.worktree.path, relativePaths)
      return { ok: true }
    }
    await bulkUnstageFiles(target.worktree.path, relativePaths)
    return { ok: true }
  }

  async discardRuntimeGitPath(worktreeSelector: string, filePath: string): Promise<{ ok: true }> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const relativePath = normalizeRuntimeRelativePath(filePath)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      await provider.discardChanges(target.worktree.path, relativePath)
      return { ok: true }
    }
    await discardChanges(target.worktree.path, relativePath)
    return { ok: true }
  }

  async getRuntimeGitRemoteFileUrl(
    worktreeSelector: string,
    relativePath: string,
    line: number
  ): Promise<string | null> {
    const target = await this.host.resolveRuntimeGitTarget(worktreeSelector)
    const normalizedRelativePath = normalizeRuntimeRelativePath(relativePath)
    const provider = target.connectionId ? getSshGitProvider(target.connectionId) : null
    if (target.connectionId) {
      if (!provider) {
        throw new Error('remote_git_unavailable')
      }
      return provider.getRemoteFileUrl(target.worktree.path, normalizedRelativePath, line)
    }
    return getRemoteFileUrl(target.worktree.path, normalizedRelativePath, line)
  }
}