-- ============ Workspaces ============
CREATE TABLE workspaces (
  id              UUID PRIMARY KEY,
  project_id      UUID NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
  slug            TEXT NOT NULL,
  name            TEXT NOT NULL,
  description     TEXT NOT NULL DEFAULT '',
  git_remote_url  TEXT NOT NULL,
  default_branch  TEXT NOT NULL DEFAULT 'main',
  main_path       TEXT NOT NULL,
  sync_status     TEXT NOT NULL DEFAULT 'cloning',
  last_synced_at  TIMESTAMPTZ,
  last_sync_error TEXT,
  created_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at      TIMESTAMPTZ NOT NULL DEFAULT now(),
  CONSTRAINT workspaces_sync_status_check CHECK (sync_status IN ('cloning','idle','syncing','error')),
  UNIQUE (project_id, slug),
  UNIQUE (project_id, id)
);
CREATE INDEX idx_workspaces_project ON workspaces(project_id);

-- ============ Worktrees ============
CREATE TABLE workspace_worktrees (
  id            UUID PRIMARY KEY,
  workspace_id  UUID NOT NULL REFERENCES workspaces(id) ON DELETE CASCADE,
  branch        TEXT NOT NULL,
  path          TEXT NOT NULL,
  status        TEXT NOT NULL DEFAULT 'idle',
  active_holder TEXT,
  acquired_at   TIMESTAMPTZ,
  last_used_at  TIMESTAMPTZ NOT NULL DEFAULT now(),
  created_at    TIMESTAMPTZ NOT NULL DEFAULT now(),
  CONSTRAINT worktrees_status_check CHECK (status IN ('idle','active','pruning')),
  UNIQUE (workspace_id, branch),
  UNIQUE (workspace_id, path)
);
CREATE INDEX idx_worktrees_ws_status ON workspace_worktrees(workspace_id, status, last_used_at);

-- ============ Git credentials ============
CREATE TABLE git_credentials (
  id               UUID PRIMARY KEY,
  workspace_id     UUID NOT NULL UNIQUE REFERENCES workspaces(id) ON DELETE CASCADE,
  kind             TEXT NOT NULL,
  username         TEXT,
  encrypted_secret BYTEA,
  fingerprint      TEXT,
  created_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at       TIMESTAMPTZ NOT NULL DEFAULT now(),
  CONSTRAINT git_credentials_kind_check CHECK (kind IN ('pat','ssh_key','none'))
);

-- ============ ALTER existing PM tables ============
ALTER TABLE issues ADD COLUMN workspace_id UUID NULL;
ALTER TABLE issues ADD CONSTRAINT issues_project_workspace_fk
  FOREIGN KEY (project_id, workspace_id)
  REFERENCES workspaces (project_id, id) MATCH SIMPLE
  ON DELETE SET NULL;
CREATE INDEX idx_issues_workspace_status ON issues(workspace_id, status);

ALTER TABLE requirements ADD COLUMN workspace_id UUID NULL
  REFERENCES workspaces(id) ON DELETE SET NULL;
CREATE INDEX idx_requirements_workspace ON requirements(workspace_id);