package models

import (
	"time"

	"github.com/google/uuid"
	"gorm.io/gorm"
)

type TokenType string

const (
	TokenTypeVerifyEmail   TokenType = "verify_email"
	TokenTypeResetPassword TokenType = "reset_password"
)

type User struct {
	ID            uuid.UUID `gorm:"type:uuid;default:gen_random_uuid();primaryKey" json:"id"`
	Email         string    `gorm:"uniqueIndex;not null" json:"email"`
	PasswordHash  *string   `json:"-"`
	Name          string    `gorm:"not null" json:"name"`
	EmailVerified bool      `gorm:"not null;default:false" json:"email_verified"`
	Approved      bool      `gorm:"not null;default:false" json:"approved"`
	CreatedAt     time.Time `gorm:"not null;default:now()" json:"created_at"`
	UpdatedAt     time.Time `gorm:"not null;default:now()" json:"updated_at"`
}

type UserRepo struct {
	UserID uuid.UUID `gorm:"type:uuid;not null;primaryKey"`
	RepoID uuid.UUID `gorm:"type:uuid;not null;primaryKey"`
	User   User      `gorm:"foreignKey:UserID;constraint:OnDelete:CASCADE"`
	Repo   Repo      `gorm:"foreignKey:RepoID;constraint:OnDelete:CASCADE"`
}

type OAuthAccount struct {
	ID             uuid.UUID `gorm:"type:uuid;default:gen_random_uuid();primaryKey" json:"id"`
	UserID         uuid.UUID `gorm:"type:uuid;not null;index" json:"user_id"`
	User           User      `gorm:"foreignKey:UserID;constraint:OnDelete:CASCADE" json:"-"`
	Provider       string    `gorm:"not null" json:"provider"`
	ProviderUserID string    `gorm:"not null" json:"provider_user_id"`
	Email          string    `gorm:"not null" json:"email"`
	CreatedAt      time.Time `gorm:"not null;default:now()" json:"created_at"`
}

func (OAuthAccount) TableName() string { return "oauth_accounts" }

type Session struct {
	Token     string    `gorm:"primaryKey" json:"token"`
	UserID    uuid.UUID `gorm:"type:uuid;not null;index" json:"user_id"`
	User      User      `gorm:"foreignKey:UserID;constraint:OnDelete:CASCADE" json:"-"`
	Data      []byte    `gorm:"not null" json:"data"`
	ExpiresAt time.Time `gorm:"not null;index" json:"expires_at"`
}

type Repo struct {
	ID                uuid.UUID  `gorm:"type:uuid;default:gen_random_uuid();primaryKey" json:"id"`
	Name              string     `gorm:"not null" json:"name"`
	Slug              string     `gorm:"uniqueIndex;not null" json:"slug"`
	ForgejoOwner      string     `gorm:"not null" json:"forgejo_owner"`
	ForgejoRepo       string     `gorm:"not null" json:"forgejo_repo"`
	WebhookSecret     string     `gorm:"not null" json:"webhook_secret"`
	WebhookVerified   bool       `gorm:"not null;default:false" json:"webhook_verified"`
	WebhookVerifiedAt *time.Time `json:"webhook_verified_at"`
	Active            bool       `gorm:"not null;default:true" json:"active"`
	CreatedAt         time.Time  `gorm:"not null;default:now()" json:"created_at"`
}

type Ticket struct {
	ID                 uuid.UUID `gorm:"type:uuid;default:gen_random_uuid();primaryKey"`
	UserID             uuid.UUID `gorm:"type:uuid;not null;index"`
	User               User      `gorm:"foreignKey:UserID;constraint:OnDelete:CASCADE"`
	RepoID             uuid.UUID `gorm:"type:uuid;not null;index"`
	Repo               Repo      `gorm:"foreignKey:RepoID;constraint:OnDelete:CASCADE"`
	ForgejoIssueNumber int64     `gorm:"not null"`
	CreatedAt          time.Time `gorm:"not null;default:now()"`
}

type EmailToken struct {
	ID        uuid.UUID  `gorm:"type:uuid;default:gen_random_uuid();primaryKey" json:"id"`
	UserID    uuid.UUID  `gorm:"type:uuid;not null;index" json:"user_id"`
	User      User       `gorm:"foreignKey:UserID;constraint:OnDelete:CASCADE" json:"-"`
	TokenHash string     `gorm:"uniqueIndex;not null" json:"token_hash"`
	TokenType TokenType  `gorm:"type:token_type;not null" json:"token_type"`
	ExpiresAt time.Time  `gorm:"not null" json:"expires_at"`
	UsedAt    *time.Time `json:"used_at"`
}

// AutoMigrate runs GORM auto-migration for all models.
func AutoMigrate(db *gorm.DB) error {
	// Create enum types if they don't exist
	db.Exec("DO $$ BEGIN CREATE TYPE token_type AS ENUM ('verify_email', 'reset_password'); EXCEPTION WHEN duplicate_object THEN null; END $$;")

	// Migration: Drop ticket_comments table (no longer used)
	db.Exec("DROP TABLE IF EXISTS ticket_comments")

	// Migration: Drop removed columns from tickets
	db.Exec("ALTER TABLE tickets DROP COLUMN IF EXISTS title")
	db.Exec("ALTER TABLE tickets DROP COLUMN IF EXISTS description")
	db.Exec("ALTER TABLE tickets DROP COLUMN IF EXISTS status")
	db.Exec("ALTER TABLE tickets DROP COLUMN IF EXISTS updated_at")

	// Migration: Delete any tickets without a Forgejo issue number, then make it NOT NULL
	db.Exec("DELETE FROM tickets WHERE forgejo_issue_number IS NULL")
	db.Exec("ALTER TABLE tickets ALTER COLUMN forgejo_issue_number SET NOT NULL")

	// Drop the old partial unique index
	db.Exec("DROP INDEX IF EXISTS idx_tickets_repo_forgejo_issue")

	// Drop the old ticket_status enum type (no longer used)
	db.Exec("DROP TYPE IF EXISTS ticket_status")

	if err := db.AutoMigrate(
		&User{},
		&OAuthAccount{},
		&Session{},
		&Repo{},
		&Ticket{},
		&EmailToken{},
		&UserRepo{},
	); err != nil {
		return err
	}

	// Create unique composite index for oauth_accounts
	db.Exec("CREATE UNIQUE INDEX IF NOT EXISTS idx_oauth_provider_user ON oauth_accounts(provider, provider_user_id)")

	// Create unique index for ticket forgejo issue lookup
	db.Exec("CREATE UNIQUE INDEX IF NOT EXISTS idx_tickets_repo_forgejo_issue ON tickets(repo_id, forgejo_issue_number)")

	// Approve all existing verified users so they aren't locked out
	db.Exec("UPDATE users SET approved = true WHERE approved = false AND email_verified = true")

	return nil
}