-- ImageForge initial schema
-- NOTE: This is a starting point; evolve via new migrations.

BEGIN;

-- Extensions
CREATE EXTENSION IF NOT EXISTS pgcrypto;

-- Enums
DO $$ BEGIN
  CREATE TYPE user_role AS ENUM ('user', 'admin');
EXCEPTION
  WHEN duplicate_object THEN NULL;
END $$;

DO $$ BEGIN
  CREATE TYPE task_status AS ENUM ('pending', 'processing', 'completed', 'failed', 'cancelled');
EXCEPTION
  WHEN duplicate_object THEN NULL;
END $$;

DO $$ BEGIN
  CREATE TYPE file_status AS ENUM ('pending', 'processing', 'completed', 'failed');
EXCEPTION
  WHEN duplicate_object THEN NULL;
END $$;

DO $$ BEGIN
  CREATE TYPE compression_level AS ENUM ('high', 'medium', 'low');
EXCEPTION
  WHEN duplicate_object THEN NULL;
END $$;

DO $$ BEGIN
  CREATE TYPE task_source AS ENUM ('web', 'api');
EXCEPTION
  WHEN duplicate_object THEN NULL;
END $$;

DO $$ BEGIN
  CREATE TYPE subscription_status AS ENUM ('trialing', 'active', 'past_due', 'paused', 'canceled', 'incomplete');
EXCEPTION
  WHEN duplicate_object THEN NULL;
END $$;

DO $$ BEGIN
  CREATE TYPE invoice_status AS ENUM ('draft', 'open', 'paid', 'void', 'uncollectible');
EXCEPTION
  WHEN duplicate_object THEN NULL;
END $$;

DO $$ BEGIN
  CREATE TYPE payment_status AS ENUM ('pending', 'succeeded', 'failed', 'refunded');
EXCEPTION
  WHEN duplicate_object THEN NULL;
END $$;

-- users
CREATE TABLE IF NOT EXISTS users (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  email VARCHAR(255) NOT NULL UNIQUE,
  username VARCHAR(50) NOT NULL UNIQUE,
  password_hash VARCHAR(255) NOT NULL,
  role user_role NOT NULL DEFAULT 'user',
  is_active BOOLEAN NOT NULL DEFAULT true,

  email_verified_at TIMESTAMPTZ,

  billing_customer_id VARCHAR(200),

  rate_limit_override INTEGER,
  storage_limit_mb INTEGER,

  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_users_role ON users(role);
CREATE INDEX IF NOT EXISTS idx_users_created_at ON users(created_at);
CREATE INDEX IF NOT EXISTS idx_users_email_verified ON users(email_verified_at) WHERE email_verified_at IS NULL;

-- email_verifications
CREATE TABLE IF NOT EXISTS email_verifications (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  token_hash VARCHAR(64) NOT NULL,
  expires_at TIMESTAMPTZ NOT NULL,
  verified_at TIMESTAMPTZ,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_email_verifications_token ON email_verifications(token_hash);
CREATE INDEX IF NOT EXISTS idx_email_verifications_user_id ON email_verifications(user_id);
CREATE INDEX IF NOT EXISTS idx_email_verifications_expires ON email_verifications(expires_at) WHERE verified_at IS NULL;

-- password_resets
CREATE TABLE IF NOT EXISTS password_resets (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  token_hash VARCHAR(64) NOT NULL,
  expires_at TIMESTAMPTZ NOT NULL,
  used_at TIMESTAMPTZ,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_password_resets_token ON password_resets(token_hash);
CREATE INDEX IF NOT EXISTS idx_password_resets_user_id ON password_resets(user_id);
CREATE INDEX IF NOT EXISTS idx_password_resets_expires ON password_resets(expires_at) WHERE used_at IS NULL;

-- plans
CREATE TABLE IF NOT EXISTS plans (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  code VARCHAR(50) NOT NULL UNIQUE,
  name VARCHAR(100) NOT NULL,
  description TEXT,

  stripe_product_id VARCHAR(200),
  stripe_price_id VARCHAR(200),

  currency VARCHAR(10) NOT NULL DEFAULT 'CNY',
  amount_cents INTEGER NOT NULL DEFAULT 0,
  interval VARCHAR(20) NOT NULL DEFAULT 'monthly',

  included_units_per_period INTEGER NOT NULL,
  max_file_size_mb INTEGER NOT NULL,
  max_files_per_batch INTEGER NOT NULL,
  concurrency_limit INTEGER NOT NULL,
  retention_days INTEGER NOT NULL,

  features JSONB NOT NULL DEFAULT '{}'::jsonb,
  is_active BOOLEAN NOT NULL DEFAULT true,

  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_plans_is_active ON plans(is_active);

-- subscriptions
CREATE TABLE IF NOT EXISTS subscriptions (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  plan_id UUID NOT NULL REFERENCES plans(id),

  status subscription_status NOT NULL DEFAULT 'incomplete',
  current_period_start TIMESTAMPTZ NOT NULL,
  current_period_end TIMESTAMPTZ NOT NULL,

  cancel_at_period_end BOOLEAN NOT NULL DEFAULT false,
  canceled_at TIMESTAMPTZ,

  provider VARCHAR(20) NOT NULL DEFAULT 'none',
  provider_customer_id VARCHAR(200),
  provider_subscription_id VARCHAR(200),

  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_subscriptions_user_id ON subscriptions(user_id);
CREATE INDEX IF NOT EXISTS idx_subscriptions_status ON subscriptions(status);

-- api_keys (Pro/Business only; enforced at application layer)
CREATE TABLE IF NOT EXISTS api_keys (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,

  name VARCHAR(100) NOT NULL,
  key_prefix VARCHAR(20) NOT NULL,
  key_hash VARCHAR(255) NOT NULL,

  permissions JSONB NOT NULL DEFAULT '["compress"]',
  rate_limit INTEGER NOT NULL DEFAULT 100,
  is_active BOOLEAN NOT NULL DEFAULT true,

  last_used_at TIMESTAMPTZ,
  last_used_ip INET,

  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_api_keys_user_id ON api_keys(user_id);
CREATE UNIQUE INDEX IF NOT EXISTS idx_api_keys_prefix ON api_keys(key_prefix);
CREATE INDEX IF NOT EXISTS idx_api_keys_is_active ON api_keys(is_active);

-- tasks
CREATE TABLE IF NOT EXISTS tasks (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

  user_id UUID REFERENCES users(id) ON DELETE SET NULL,
  session_id VARCHAR(100),
  api_key_id UUID REFERENCES api_keys(id) ON DELETE SET NULL,

  source task_source NOT NULL DEFAULT 'web',
  status task_status NOT NULL DEFAULT 'pending',

  compression_level compression_level NOT NULL DEFAULT 'medium',
  output_format VARCHAR(10),
  max_width INTEGER,
  max_height INTEGER,
  preserve_metadata BOOLEAN NOT NULL DEFAULT false,

  total_files INTEGER NOT NULL DEFAULT 0,
  completed_files INTEGER NOT NULL DEFAULT 0,
  failed_files INTEGER NOT NULL DEFAULT 0,
  total_original_size BIGINT NOT NULL DEFAULT 0,
  total_compressed_size BIGINT NOT NULL DEFAULT 0,

  error_message TEXT,

  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  started_at TIMESTAMPTZ,
  completed_at TIMESTAMPTZ,

  expires_at TIMESTAMPTZ NOT NULL DEFAULT (NOW() + INTERVAL '24 hours')
);

CREATE INDEX IF NOT EXISTS idx_tasks_user_id ON tasks(user_id);
CREATE INDEX IF NOT EXISTS idx_tasks_session_id ON tasks(session_id);
CREATE INDEX IF NOT EXISTS idx_tasks_status ON tasks(status);
CREATE INDEX IF NOT EXISTS idx_tasks_created_at ON tasks(created_at);
CREATE INDEX IF NOT EXISTS idx_tasks_expires_at ON tasks(expires_at);

-- task_files
CREATE TABLE IF NOT EXISTS task_files (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  task_id UUID NOT NULL REFERENCES tasks(id) ON DELETE CASCADE,

  original_name VARCHAR(255) NOT NULL,
  original_format VARCHAR(10) NOT NULL,
  output_format VARCHAR(10) NOT NULL,

  original_size BIGINT NOT NULL,
  compressed_size BIGINT,
  saved_percent DECIMAL(6, 2),

  storage_path VARCHAR(500),
  status file_status NOT NULL DEFAULT 'pending',
  error_message TEXT,

  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  completed_at TIMESTAMPTZ
);

CREATE INDEX IF NOT EXISTS idx_task_files_task_id ON task_files(task_id);
CREATE INDEX IF NOT EXISTS idx_task_files_status ON task_files(status);

-- idempotency_keys
CREATE TABLE IF NOT EXISTS idempotency_keys (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

  user_id UUID REFERENCES users(id) ON DELETE CASCADE,
  api_key_id UUID REFERENCES api_keys(id) ON DELETE CASCADE,

  idempotency_key VARCHAR(128) NOT NULL,
  request_hash VARCHAR(64) NOT NULL,

  response_status INTEGER NOT NULL,
  response_body JSONB,

  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  expires_at TIMESTAMPTZ NOT NULL
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_idempotency_user_key
  ON idempotency_keys(user_id, idempotency_key) WHERE user_id IS NOT NULL;
CREATE UNIQUE INDEX IF NOT EXISTS idx_idempotency_api_key_key
  ON idempotency_keys(api_key_id, idempotency_key) WHERE api_key_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_idempotency_expires_at ON idempotency_keys(expires_at);

-- usage_events
CREATE TABLE IF NOT EXISTS usage_events (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),

  user_id UUID REFERENCES users(id) ON DELETE SET NULL,
  api_key_id UUID REFERENCES api_keys(id) ON DELETE SET NULL,
  source task_source NOT NULL,

  task_id UUID REFERENCES tasks(id) ON DELETE SET NULL,
  task_file_id UUID REFERENCES task_files(id) ON DELETE SET NULL,

  units INTEGER NOT NULL DEFAULT 1,
  bytes_in BIGINT NOT NULL DEFAULT 0,
  bytes_out BIGINT NOT NULL DEFAULT 0,
  format_in VARCHAR(10),
  format_out VARCHAR(10),

  occurred_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_usage_events_task_file_unique
  ON usage_events(task_file_id) WHERE task_file_id IS NOT NULL;
CREATE INDEX IF NOT EXISTS idx_usage_events_user_time ON usage_events(user_id, occurred_at);
CREATE INDEX IF NOT EXISTS idx_usage_events_api_key_time ON usage_events(api_key_id, occurred_at);

-- usage_periods
CREATE TABLE IF NOT EXISTS usage_periods (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  subscription_id UUID REFERENCES subscriptions(id) ON DELETE SET NULL,

  period_start TIMESTAMPTZ NOT NULL,
  period_end TIMESTAMPTZ NOT NULL,

  used_units INTEGER NOT NULL DEFAULT 0,
  bytes_in BIGINT NOT NULL DEFAULT 0,
  bytes_out BIGINT NOT NULL DEFAULT 0,

  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),

  UNIQUE(user_id, period_start, period_end)
);

CREATE INDEX IF NOT EXISTS idx_usage_periods_user_period ON usage_periods(user_id, period_start);

-- invoices
CREATE TABLE IF NOT EXISTS invoices (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  subscription_id UUID REFERENCES subscriptions(id) ON DELETE SET NULL,

  invoice_number VARCHAR(50) NOT NULL UNIQUE,
  status invoice_status NOT NULL DEFAULT 'open',
  currency VARCHAR(10) NOT NULL DEFAULT 'CNY',
  total_amount_cents INTEGER NOT NULL DEFAULT 0,

  period_start TIMESTAMPTZ,
  period_end TIMESTAMPTZ,

  provider VARCHAR(20) NOT NULL DEFAULT 'none',
  provider_invoice_id VARCHAR(200),
  hosted_invoice_url TEXT,
  pdf_url TEXT,

  due_at TIMESTAMPTZ,
  paid_at TIMESTAMPTZ,

  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_invoices_user_id ON invoices(user_id);
CREATE INDEX IF NOT EXISTS idx_invoices_status ON invoices(status);

-- payments
CREATE TABLE IF NOT EXISTS payments (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  invoice_id UUID REFERENCES invoices(id) ON DELETE SET NULL,

  provider VARCHAR(20) NOT NULL DEFAULT 'none',
  provider_payment_id VARCHAR(200),

  status payment_status NOT NULL DEFAULT 'pending',
  currency VARCHAR(10) NOT NULL DEFAULT 'CNY',
  amount_cents INTEGER NOT NULL DEFAULT 0,
  paid_at TIMESTAMPTZ,

  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_payments_user_id ON payments(user_id);
CREATE INDEX IF NOT EXISTS idx_payments_status ON payments(status);

-- webhook_events
CREATE TABLE IF NOT EXISTS webhook_events (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  provider VARCHAR(20) NOT NULL,
  provider_event_id VARCHAR(200) NOT NULL,
  event_type VARCHAR(200) NOT NULL,
  payload JSONB NOT NULL,
  received_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  processed_at TIMESTAMPTZ,
  status VARCHAR(20) NOT NULL DEFAULT 'received',
  error_message TEXT
);

CREATE UNIQUE INDEX IF NOT EXISTS idx_webhook_events_unique ON webhook_events(provider, provider_event_id);
CREATE INDEX IF NOT EXISTS idx_webhook_events_status ON webhook_events(status);

-- system_config
CREATE TABLE IF NOT EXISTS system_config (
  key VARCHAR(100) PRIMARY KEY,
  value JSONB NOT NULL,
  description TEXT,
  updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
  updated_by UUID REFERENCES users(id)
);

-- audit_logs
CREATE TABLE IF NOT EXISTS audit_logs (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID REFERENCES users(id) ON DELETE SET NULL,
  action VARCHAR(50) NOT NULL,
  resource_type VARCHAR(50),
  resource_id UUID,
  details JSONB,
  ip_address INET,
  user_agent TEXT,
  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

CREATE INDEX IF NOT EXISTS idx_audit_logs_user_id ON audit_logs(user_id);
CREATE INDEX IF NOT EXISTS idx_audit_logs_action ON audit_logs(action);
CREATE INDEX IF NOT EXISTS idx_audit_logs_created_at ON audit_logs(created_at);

-- Default config seeds
INSERT INTO system_config (key, value, description)
VALUES
  ('features', '{"registration_enabled": true, "api_key_enabled": true, "anonymous_upload_enabled": true}', '功能开关'),
  ('rate_limits', '{"anonymous_per_minute": 10, "anonymous_units_per_day": 10, "user_per_minute": 60, "api_key_per_minute": 100}', '速率限制默认值'),
  ('file_limits', '{"max_image_pixels": 40000000}', '图片安全限制（像素上限等）')
ON CONFLICT (key) DO NOTHING;

INSERT INTO plans (code, name, stripe_price_id, currency, amount_cents, interval, included_units_per_period, max_file_size_mb, max_files_per_batch, concurrency_limit, retention_days, features)
VALUES
  ('free', 'Free', NULL, 'CNY', 0, 'monthly', 500, 5, 10, 2, 1, '{"webhook": false, "api": false}'),
  ('pro_monthly', 'Pro（月付）', 'price_xxx_pro_monthly', 'CNY', 1999, 'monthly', 10000, 20, 50, 8, 7, '{"webhook": true, "api": true}'),
  ('business_monthly', 'Business（月付）', 'price_xxx_business_monthly', 'CNY', 9999, 'monthly', 100000, 50, 200, 32, 30, '{"webhook": true, "api": true, "ip_allowlist": true}')
ON CONFLICT (code) DO NOTHING;

COMMIT;