-- ============================================================================
-- Project Management — Post-sale project tracking with milestones
-- ============================================================================

CREATE TABLE IF NOT EXISTS project_statuses (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    name VARCHAR(50) NOT NULL UNIQUE,
    color VARCHAR(7),
    sort_order INT NOT NULL DEFAULT 0,
    is_active BOOLEAN NOT NULL DEFAULT TRUE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE TABLE IF NOT EXISTS projects (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    customer_id UUID NOT NULL REFERENCES customers(id),
    opportunity_id UUID REFERENCES opportunities(id),
    owner_id UUID NOT NULL REFERENCES users(id),
    name VARCHAR(255) NOT NULL,
    description TEXT,
    status_id UUID NOT NULL REFERENCES project_statuses(id),
    start_date DATE,
    target_end_date DATE,
    actual_end_date DATE,
    budget DECIMAL(15,2),
    created_by UUID NOT NULL REFERENCES users(id),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    deleted_at TIMESTAMPTZ
);

CREATE INDEX idx_projects_customer ON projects(customer_id) WHERE deleted_at IS NULL;
CREATE INDEX idx_projects_owner ON projects(owner_id) WHERE deleted_at IS NULL;
CREATE INDEX idx_projects_status ON projects(status_id) WHERE deleted_at IS NULL;
CREATE INDEX idx_projects_created ON projects(created_at) WHERE deleted_at IS NULL;

CREATE TABLE IF NOT EXISTS project_milestones (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    project_id UUID NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
    name VARCHAR(255) NOT NULL,
    description TEXT,
    sort_order INT NOT NULL DEFAULT 0,
    status VARCHAR(20) NOT NULL DEFAULT 'pending',
    start_date DATE,
    due_date DATE,
    completed_at TIMESTAMPTZ,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    CONSTRAINT chk_milestone_status CHECK (status IN ('pending','in_progress','completed','cancelled'))
);

CREATE INDEX idx_milestones_project ON project_milestones(project_id);
CREATE INDEX idx_milestones_status ON project_milestones(status);
CREATE INDEX idx_milestones_due ON project_milestones(due_date);

ALTER TABLE tasks ADD COLUMN IF NOT EXISTS project_id UUID REFERENCES projects(id) ON DELETE CASCADE;
ALTER TABLE tasks ADD COLUMN IF NOT EXISTS milestone_id UUID REFERENCES project_milestones(id) ON DELETE SET NULL;

CREATE INDEX IF NOT EXISTS idx_tasks_project ON tasks(project_id) WHERE project_id IS NOT NULL AND deleted_at IS NULL;
CREATE INDEX IF NOT EXISTS idx_tasks_milestone ON tasks(milestone_id) WHERE milestone_id IS NOT NULL AND deleted_at IS NULL;

-- Seed project statuses
INSERT INTO project_statuses (name, color, sort_order) VALUES
  ('Planning', '#6366f1', 1),
  ('In Progress', '#22c55e', 2),
  ('Review', '#eab308', 3),
  ('Completed', '#22d3ee', 4),
  ('On Hold', '#f97316', 5),
  ('Cancelled', '#ef4444', 6)
ON CONFLICT (name) DO NOTHING;

-- Seed a sample project from the existing TechCorp opportunity
DO $$
DECLARE
  v_customer_id UUID;
  v_opportunity_id UUID;
  v_owner_id UUID;
  v_planning_id UUID;
  v_progress_id UUID;
  v_project_id UUID;
BEGIN
  SELECT id INTO v_customer_id FROM customers LIMIT 1;
  SELECT id INTO v_opportunity_id FROM opportunities LIMIT 1;
  SELECT u.id INTO v_owner_id FROM users u JOIN user_roles ur ON ur.user_id = u.id JOIN roles r ON r.id = ur.role_id WHERE r.name = 'SALES_USER' LIMIT 1;
  IF v_owner_id IS NULL THEN SELECT id INTO v_owner_id FROM users LIMIT 1; END IF;
  SELECT id INTO v_planning_id FROM project_statuses WHERE name = 'Planning';
  SELECT id INTO v_progress_id FROM project_statuses WHERE name = 'In Progress';

  IF v_customer_id IS NOT NULL AND NOT EXISTS (SELECT 1 FROM projects WHERE name = 'TechCorp Website Redesign') THEN
    INSERT INTO projects (customer_id, opportunity_id, owner_id, name, description, status_id, start_date, target_end_date, budget, created_by)
    VALUES (v_customer_id, v_opportunity_id, v_owner_id, 'TechCorp Website Redesign',
            'Full website redesign including homepage, services pages, and contact forms',
            v_planning_id, CURRENT_DATE, CURRENT_DATE + INTERVAL '60 days', 25000.00, v_owner_id)
    RETURNING id INTO v_project_id;

    INSERT INTO project_milestones (project_id, name, description, sort_order, status, start_date, due_date) VALUES
      (v_project_id, 'Requirements & Wireframes', 'Gather requirements, create wireframes for approval', 1, 'in_progress', CURRENT_DATE, CURRENT_DATE + INTERVAL '10 days'),
      (v_project_id, 'Design Mockups', 'Create visual design mockups for all pages', 2, 'pending', CURRENT_DATE + INTERVAL '10 days', CURRENT_DATE + INTERVAL '20 days'),
      (v_project_id, 'Frontend Development', 'Build responsive frontend components', 3, 'pending', CURRENT_DATE + INTERVAL '20 days', CURRENT_DATE + INTERVAL '35 days'),
      (v_project_id, 'Backend Integration', 'Integrate CMS, forms, and email functionality', 4, 'pending', CURRENT_DATE + INTERVAL '35 days', CURRENT_DATE + INTERVAL '45 days'),
      (v_project_id, 'Testing & QA', 'Cross-browser testing, performance optimization', 5, 'pending', CURRENT_DATE + INTERVAL '45 days', CURRENT_DATE + INTERVAL '55 days'),
      (v_project_id, 'Launch', 'Deploy to production, final sign-off', 6, 'pending', CURRENT_DATE + INTERVAL '55 days', CURRENT_DATE + INTERVAL '60 days');
  END IF;
END $$;