-- To-do list support: projects, tags, tasks, and related tables

-- Projects (Layer 2)
CREATE TABLE projects (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    owner_id UUID NOT NULL REFERENCES users(id),
    name TEXT NOT NULL,
    color TEXT NOT NULL DEFAULT '#3B82F6',
    is_shared BOOLEAN NOT NULL DEFAULT false,
    deadline TIMESTAMPTZ,
    sort_order INTEGER NOT NULL DEFAULT 0,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    deleted_at TIMESTAMPTZ
);

CREATE INDEX idx_projects_owner_id ON projects (owner_id);

-- Project Members (Layer 2 shared projects)
CREATE TABLE project_members (
    project_id UUID NOT NULL REFERENCES projects(id),
    user_id UUID NOT NULL REFERENCES users(id),
    role TEXT NOT NULL CHECK (role IN ('owner', 'editor', 'viewer')),
    PRIMARY KEY (project_id, user_id)
);

CREATE INDEX idx_project_members_project_id ON project_members (project_id);

-- Tags (Layer 2)
CREATE TABLE tags (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    owner_id UUID NOT NULL REFERENCES users(id),
    name TEXT NOT NULL,
    color TEXT NOT NULL DEFAULT '#6B7280',
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX idx_tags_owner_id ON tags (owner_id);

-- Tasks (Layer 1 core)
CREATE TABLE tasks (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    owner_id UUID NOT NULL REFERENCES users(id),
    title TEXT NOT NULL,
    description TEXT,
    status TEXT NOT NULL DEFAULT 'todo' CHECK (status IN ('todo', 'in_progress', 'done', 'archived')),
    priority TEXT NOT NULL DEFAULT 'medium' CHECK (priority IN ('low', 'medium', 'high', 'critical')),
    due_date TIMESTAMPTZ,
    completed_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
    deleted_at TIMESTAMPTZ,
    project_id UUID REFERENCES projects(id),
    parent_id UUID REFERENCES tasks(id),
    sort_order INTEGER NOT NULL DEFAULT 0,
    recurrence_rule TEXT
);

CREATE INDEX idx_tasks_owner_id ON tasks (owner_id);
CREATE INDEX idx_tasks_status ON tasks (owner_id, status) WHERE deleted_at IS NULL;
CREATE INDEX idx_tasks_priority ON tasks (owner_id, priority) WHERE deleted_at IS NULL;
CREATE INDEX idx_tasks_due_date ON tasks (owner_id, due_date) WHERE deleted_at IS NULL;
CREATE INDEX idx_tasks_project_id ON tasks (project_id) WHERE deleted_at IS NULL;
CREATE INDEX idx_tasks_parent_id ON tasks (parent_id) WHERE deleted_at IS NULL;

-- Task Tags (many-to-many)
CREATE TABLE task_tags (
    task_id UUID NOT NULL REFERENCES tasks(id),
    tag_id UUID NOT NULL REFERENCES tags(id),
    PRIMARY KEY (task_id, tag_id)
);

CREATE INDEX idx_task_tags_task_id ON task_tags (task_id);
CREATE INDEX idx_task_tags_tag_id ON task_tags (tag_id);

-- Task Dependencies (Layer 3)
-- task_id is blocked by blocks_task_id (blocker)
CREATE TABLE task_dependencies (
    task_id UUID NOT NULL REFERENCES tasks(id),
    blocks_task_id UUID NOT NULL REFERENCES tasks(id),
    PRIMARY KEY (task_id, blocks_task_id),
    CHECK (task_id != blocks_task_id)
);

CREATE INDEX idx_task_dependencies_task_id ON task_dependencies (task_id);
CREATE INDEX idx_task_dependencies_blocks ON task_dependencies (blocks_task_id);

-- Task Reminders (Layer 2)
CREATE TABLE task_reminders (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    task_id UUID NOT NULL REFERENCES tasks(id),
    type TEXT NOT NULL CHECK (type IN ('push', 'email', 'webhook', 'telegram', 'nostr')),
    config JSONB NOT NULL DEFAULT '{}',
    scheduled_at TIMESTAMPTZ NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX idx_task_reminders_task_id ON task_reminders (task_id);
CREATE INDEX idx_task_reminders_scheduled ON task_reminders (scheduled_at);

-- Task Webhooks (Layer 3)
CREATE TABLE task_webhooks (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    owner_id UUID NOT NULL REFERENCES users(id),
    url TEXT NOT NULL,
    events JSONB NOT NULL DEFAULT '[]',
    secret TEXT,
    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX idx_task_webhooks_owner_id ON task_webhooks (owner_id);